[TD-2971] feature: make python connector support unsigned type. fix pep8 format.

src/connector/python/linux/python2/taos/__init__.py

@@ -8,6 +8,7 @@ paramstyle = 'pyformat'
 
 __all__ = ['connection', 'cursor']
 
+
 def connect(*args, **kwargs):
     """ Function to return a TDengine connector object
 

src/connector/python/linux/python2/taos/cinterface.py

@@ -4,11 +4,14 @@ from .error import *
 import math
 import datetime
 
+
 def _convert_millisecond_to_datetime(milli):
-    return datetime.datetime.fromtimestamp(milli/1000.0)
+    return datetime.datetime.fromtimestamp(milli / 1000.0)
+
 
 def _convert_microsecond_to_datetime(micro):
-    return datetime.datetime.fromtimestamp(micro/1000000.0)
+    return datetime.datetime.fromtimestamp(micro / 1000000.0)
+
 
 def _crow_timestamp_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bool row to python row
@@ -18,208 +21,309 @@ def _crow_timestamp_to_python(data, num_of_rows, nbytes=None, micro=False):
         _timestamp_converter = _convert_microsecond_to_datetime
 
     if num_of_rows > 0:
-        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
+        return list(map(_timestamp_converter, ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
     else:
-        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
+        return list(map(_timestamp_converter, ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
+
 
 def _crow_bool_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bool row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_byte))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_bool))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_bool))[
+                :abs(num_of_rows)]]
+
 
 def _crow_tinyint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C tinyint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)]]
+
 
-def _crow_tinyint_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
+def _crow_tinyint_unsigned_to_python(
+        data,
+        num_of_rows,
+        nbytes=None,
+        micro=False):
     """Function to convert C tinyint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_byte))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_byte))[
+                :abs(num_of_rows)]]
+
 
 def _crow_smallint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C smallint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)]]
+        return [
+            None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_short))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_short))[
+                :abs(num_of_rows)]]
 
-def _crow_smallint_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
+
+def _crow_smallint_unsigned_to_python(
+        data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C smallint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)]]
+        return [
+            None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_short))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_short))[
+                :abs(num_of_rows)]]
+
 
 def _crow_int_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C int row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)]]
+
 
 def _crow_int_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C int row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_int))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_int))[
+                :abs(num_of_rows)]]
+
 
 def _crow_bigint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bigint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]]
+
 
-def _crow_bigint_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
+def _crow_bigint_unsigned_to_python(
+        data,
+        num_of_rows,
+        nbytes=None,
+        micro=False):
     """Function to convert C bigint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_long))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_long))[
+                :abs(num_of_rows)]]
+
 
 def _crow_float_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C float row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)] ]
+        return [None if math.isnan(ele) else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)]]
     else:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)] ]
+        return [None if math.isnan(ele) else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)]]
+
 
 def _crow_double_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C double row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)] ]
+        return [None if math.isnan(ele) else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)]]
     else:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)] ]
+        return [None if math.isnan(ele) else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)]]
+
 
 def _crow_binary_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C binary row to python row
     """
     assert(nbytes is not None)
     if num_of_rows > 0:
-        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
+        return [None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode(
+            'utf-8') for ele in (ctypes.cast(data, ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
     else:
-        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
+        return [None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode(
+            'utf-8') for ele in (ctypes.cast(data, ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
+
 
 def _crow_nchar_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C nchar row to python row
     """
     assert(nbytes is not None)
-    res=[]
+    res = []
     for i in range(abs(num_of_rows)):
         try:
             if num_of_rows >= 0:
                 tmpstr = ctypes.c_char_p(data)
-                res.append( tmpstr.value.decode() )
+                res.append(tmpstr.value.decode())
             else:
-                res.append( (ctypes.cast(data+nbytes*i,  ctypes.POINTER(ctypes.c_wchar * (nbytes//4))))[0].value )
+                res.append((ctypes.cast(data + nbytes * i,
+                                        ctypes.POINTER(ctypes.c_wchar * (nbytes // 4))))[0].value)
         except ValueError:
             res.append(None)
 
     return res
 
+
 def _crow_binary_to_python_block(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C binary row to python row
     """
     assert(nbytes is not None)
-    res=[]
+    res = []
     if num_of_rows > 0:
         for i in range(abs(num_of_rows)):
             try:
-                rbyte=ctypes.cast(data+nbytes*i,ctypes.POINTER(ctypes.c_short))[:1].pop()
-                tmpstr = ctypes.c_char_p(data+nbytes*i+2)
-                res.append( tmpstr.value.decode()[0:rbyte] )
+                rbyte = ctypes.cast(
+                    data + nbytes * i,
+                    ctypes.POINTER(
+                        ctypes.c_short))[
+                    :1].pop()
+                tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
+                res.append(tmpstr.value.decode()[0:rbyte])
             except ValueError:
                 res.append(None)
     else:
         for i in range(abs(num_of_rows)):
             try:
-                rbyte=ctypes.cast(data+nbytes*i,ctypes.POINTER(ctypes.c_short))[:1].pop()
-                tmpstr = ctypes.c_char_p(data+nbytes*i+2)
-                res.append( tmpstr.value.decode()[0:rbyte] )
+                rbyte = ctypes.cast(
+                    data + nbytes * i,
+                    ctypes.POINTER(
+                        ctypes.c_short))[
+                    :1].pop()
+                tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
+                res.append(tmpstr.value.decode()[0:rbyte])
             except ValueError:
                 res.append(None)
     return res
 
+
 def _crow_nchar_to_python_block(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C nchar row to python row
     """
     assert(nbytes is not None)
-    res=[]
+    res = []
     if num_of_rows >= 0:
         for i in range(abs(num_of_rows)):
             try:
-                tmpstr = ctypes.c_char_p(data+nbytes*i+2)
-                res.append( tmpstr.value.decode() )
+                tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
+                res.append(tmpstr.value.decode())
             except ValueError:
                 res.append(None)
     else:
         for i in range(abs(num_of_rows)):
             try:
-                res.append( (ctypes.cast(data+nbytes*i+2,  ctypes.POINTER(ctypes.c_wchar * (nbytes//4))))[0].value )
+                res.append((ctypes.cast(data + nbytes * i + 2,
+                                        ctypes.POINTER(ctypes.c_wchar * (nbytes // 4))))[0].value)
             except ValueError:
                 res.append(None)
     return res
 
+
 _CONVERT_FUNC = {
     FieldType.C_BOOL: _crow_bool_to_python,
-    FieldType.C_TINYINT : _crow_tinyint_to_python,
-    FieldType.C_SMALLINT : _crow_smallint_to_python,
-    FieldType.C_INT : _crow_int_to_python,
-    FieldType.C_BIGINT : _crow_bigint_to_python,
-    FieldType.C_FLOAT : _crow_float_to_python,
-    FieldType.C_DOUBLE : _crow_double_to_python,
+    FieldType.C_TINYINT: _crow_tinyint_to_python,
+    FieldType.C_SMALLINT: _crow_smallint_to_python,
+    FieldType.C_INT: _crow_int_to_python,
+    FieldType.C_BIGINT: _crow_bigint_to_python,
+    FieldType.C_FLOAT: _crow_float_to_python,
+    FieldType.C_DOUBLE: _crow_double_to_python,
     FieldType.C_BINARY: _crow_binary_to_python,
-    FieldType.C_TIMESTAMP : _crow_timestamp_to_python,
-    FieldType.C_NCHAR : _crow_nchar_to_python,
-    FieldType.C_TINYINT_UNSIGNED : _crow_tinyint_unsigned_to_python,
-    FieldType.C_SMALLINT_UNSIGNED : _crow_smallint_unsigned_to_python,
-    FieldType.C_INT_UNSIGNED : _crow_int_unsigned_to_python,
-    FieldType.C_BIGINT_UNSIGNED : _crow_bigint_unsigned_to_python
+    FieldType.C_TIMESTAMP: _crow_timestamp_to_python,
+    FieldType.C_NCHAR: _crow_nchar_to_python,
+    FieldType.C_TINYINT_UNSIGNED: _crow_tinyint_unsigned_to_python,
+    FieldType.C_SMALLINT_UNSIGNED: _crow_smallint_unsigned_to_python,
+    FieldType.C_INT_UNSIGNED: _crow_int_unsigned_to_python,
+    FieldType.C_BIGINT_UNSIGNED: _crow_bigint_unsigned_to_python
 }
 
 _CONVERT_FUNC_BLOCK = {
     FieldType.C_BOOL: _crow_bool_to_python,
-    FieldType.C_TINYINT : _crow_tinyint_to_python,
-    FieldType.C_SMALLINT : _crow_smallint_to_python,
-    FieldType.C_INT : _crow_int_to_python,
-    FieldType.C_BIGINT : _crow_bigint_to_python,
-    FieldType.C_FLOAT : _crow_float_to_python,
-    FieldType.C_DOUBLE : _crow_double_to_python,
+    FieldType.C_TINYINT: _crow_tinyint_to_python,
+    FieldType.C_SMALLINT: _crow_smallint_to_python,
+    FieldType.C_INT: _crow_int_to_python,
+    FieldType.C_BIGINT: _crow_bigint_to_python,
+    FieldType.C_FLOAT: _crow_float_to_python,
+    FieldType.C_DOUBLE: _crow_double_to_python,
     FieldType.C_BINARY: _crow_binary_to_python_block,
-    FieldType.C_TIMESTAMP : _crow_timestamp_to_python,
-    FieldType.C_NCHAR : _crow_nchar_to_python_block,
-    FieldType.C_TINYINT_UNSIGNED : _crow_tinyint_unsigned_to_python,
-    FieldType.C_SMALLINT_UNSIGNED : _crow_smallint_unsigned_to_python,
-    FieldType.C_INT_UNSIGNED : _crow_int_unsigned_to_python,
-    FieldType.C_BIGINT_UNSIGNED : _crow_bigint_unsigned_to_python
+    FieldType.C_TIMESTAMP: _crow_timestamp_to_python,
+    FieldType.C_NCHAR: _crow_nchar_to_python_block,
+    FieldType.C_TINYINT_UNSIGNED: _crow_tinyint_unsigned_to_python,
+    FieldType.C_SMALLINT_UNSIGNED: _crow_smallint_unsigned_to_python,
+    FieldType.C_INT_UNSIGNED: _crow_int_unsigned_to_python,
+    FieldType.C_BIGINT_UNSIGNED: _crow_bigint_unsigned_to_python
 }
 
 # Corresponding TAOS_FIELD structure in C
+
+
 class TaosField(ctypes.Structure):
     _fields_ = [('name', ctypes.c_char * 65),
                 ('type', ctypes.c_char),
                 ('bytes', ctypes.c_short)]
 
 # C interface class
+
+
 class CTaosInterface(object):
 
     libtaos = ctypes.CDLL('libtaos.so')
@@ -256,7 +360,7 @@ class CTaosInterface(object):
             except AttributeError:
                 raise AttributeError("config is expected as a str")
 
-        if config != None:
+        if config is not None:
             CTaosInterface.libtaos.taos_options(3, self._config)
 
         CTaosInterface.libtaos.taos_init()
@@ -267,7 +371,13 @@ class CTaosInterface(object):
         """
         return self._config
 
-    def connect(self, host=None, user="root", password="taosdata", db=None, port=0):
+    def connect(
+            self,
+            host=None,
+            user="root",
+            password="taosdata",
+            db=None,
+            port=0):
         '''
         Function to connect to server
 
@@ -276,7 +386,7 @@ class CTaosInterface(object):
         # host
         try:
             _host = ctypes.c_char_p(host.encode(
-                "utf-8")) if host != None else ctypes.c_char_p(None)
+                "utf-8")) if host is not None else ctypes.c_char_p(None)
         except AttributeError:
             raise AttributeError("host is expected as a str")
 
@@ -295,7 +405,7 @@ class CTaosInterface(object):
         # db
         try:
             _db = ctypes.c_char_p(
-                db.encode("utf-8")) if db != None else ctypes.c_char_p(None)
+                db.encode("utf-8")) if db is not None else ctypes.c_char_p(None)
         except AttributeError:
             raise AttributeError("db is expected as a str")
 
@@ -308,11 +418,11 @@ class CTaosInterface(object):
         connection = ctypes.c_void_p(CTaosInterface.libtaos.taos_connect(
             _host, _user, _password, _db, _port))
 
-        if connection.value == None:
+        if connection.value is None:
             print('connect to TDengine failed')
             raise ConnectionError("connect to TDengine failed")
             # sys.exit(1)
-        #else:
+        # else:
         #    print('connect to TDengine success')
 
         return connection
@@ -333,7 +443,8 @@ class CTaosInterface(object):
         @rtype: 0 on success and -1 on failure
         '''
         try:
-            return CTaosInterface.libtaos.taos_query(connection, ctypes.c_char_p(sql.encode('utf-8')))
+            return CTaosInterface.libtaos.taos_query(
+                connection, ctypes.c_char_p(sql.encode('utf-8')))
         except AttributeError:
             raise AttributeError("sql is expected as a string")
         # finally:
@@ -400,35 +511,49 @@ class CTaosInterface(object):
             result, ctypes.byref(pblock))
         if num_of_rows == 0:
             return None, 0
-        isMicro = (CTaosInterface.libtaos.taos_result_precision(result) == FieldType.C_TIMESTAMP_MICRO)
+        isMicro = (CTaosInterface.libtaos.taos_result_precision(
+            result) == FieldType.C_TIMESTAMP_MICRO)
         blocks = [None] * len(fields)
         fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
-        fieldLen = [ele for ele in ctypes.cast(fieldL,  ctypes.POINTER(ctypes.c_int))[:len(fields)]]
+        fieldLen = [
+            ele for ele in ctypes.cast(
+                fieldL, ctypes.POINTER(
+                    ctypes.c_int))[
+                :len(fields)]]
         for i in range(len(fields)):
             data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
             if fields[i]['type'] not in _CONVERT_FUNC_BLOCK:
                 raise DatabaseError("Invalid data type returned from database")
-            blocks[i] = _CONVERT_FUNC_BLOCK[fields[i]['type']](data, num_of_rows, fieldLen[i], isMicro)
+            blocks[i] = _CONVERT_FUNC_BLOCK[fields[i]['type']](
+                data, num_of_rows, fieldLen[i], isMicro)
 
         return blocks, abs(num_of_rows)
+
     @staticmethod
     def fetchRow(result, fields):
         pblock = ctypes.c_void_p(0)
         pblock = CTaosInterface.libtaos.taos_fetch_row(result)
-        if pblock : 
+        if pblock:
             num_of_rows = 1
-            isMicro = (CTaosInterface.libtaos.taos_result_precision(result) == FieldType.C_TIMESTAMP_MICRO)
+            isMicro = (CTaosInterface.libtaos.taos_result_precision(
+                result) == FieldType.C_TIMESTAMP_MICRO)
             blocks = [None] * len(fields)
             fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
-            fieldLen = [ele for ele in ctypes.cast(fieldL,  ctypes.POINTER(ctypes.c_int))[:len(fields)]]
+            fieldLen = [
+                ele for ele in ctypes.cast(
+                    fieldL, ctypes.POINTER(
+                        ctypes.c_int))[
+                    :len(fields)]]
             for i in range(len(fields)):
                 data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
                 if fields[i]['type'] not in _CONVERT_FUNC:
-                    raise DatabaseError("Invalid data type returned from database")
+                    raise DatabaseError(
+                        "Invalid data type returned from database")
                 if data is None:
                     blocks[i] = [None]
                 else:
-                    blocks[i] = _CONVERT_FUNC[fields[i]['type']](data, num_of_rows, fieldLen[i], isMicro)         
+                    blocks[i] = _CONVERT_FUNC[fields[i]['type']](
+                        data, num_of_rows, fieldLen[i], isMicro)
         else:
             return None, 0
         return blocks, abs(num_of_rows)

src/connector/python/linux/python2/taos/connection.py

@@ -2,9 +2,11 @@ from .cursor import TDengineCursor
 from .subscription import TDengineSubscription
 from .cinterface import CTaosInterface
 
+
 class TDengineConnection(object):
     """ TDengine connection object
     """
+
     def __init__(self, *args, **kwargs):
         self._conn = None
         self._host = None
@@ -43,7 +45,12 @@ class TDengineConnection(object):
             self._config = kwargs['config']
 
         self._chandle = CTaosInterface(self._config)
-        self._conn = self._chandle.connect(self._host, self._user, self._password, self._database, self._port)
+        self._conn = self._chandle.connect(
+            self._host,
+            self._user,
+            self._password,
+            self._database,
+            self._port)
 
     def close(self):
         """Close current connection.
@@ -55,7 +62,8 @@ class TDengineConnection(object):
         """
         if self._conn is None:
             return None
-        sub = CTaosInterface.subscribe(self._conn, restart, topic, sql, interval)
+        sub = CTaosInterface.subscribe(
+            self._conn, restart, topic, sql, interval)
         return TDengineSubscription(sub)
 
     def cursor(self):
@@ -80,6 +88,7 @@ class TDengineConnection(object):
         """
         pass
 
+
 if __name__ == "__main__":
     conn = TDengineConnection(host='192.168.1.107')
     conn.close()

src/connector/python/linux/python2/taos/constants.py

@@ -3,6 +3,7 @@
 
 from .dbapi import *
 
+
 class FieldType(object):
     """TDengine Field Types
     """

src/connector/python/linux/python2/taos/cursor.py

@@ -128,8 +128,8 @@ class TDengineCursor(object):
         if errno == 0:
             if CTaosInterface.fieldsCount(self._result) == 0:
                 self._affected_rows += CTaosInterface.affectedRows(
-                    self._result )
-                return CTaosInterface.affectedRows(self._result )
+                    self._result)
+                return CTaosInterface.affectedRows(self._result)
             else:
                 self._fields = CTaosInterface.useResult(
                     self._result)
@@ -148,6 +148,7 @@ class TDengineCursor(object):
         """Fetch the next row of a query result set, returning a single sequence, or None when no more data is available.
         """
         pass
+
     def fetchmany(self):
         pass
 
@@ -206,16 +207,20 @@ class TDengineCursor(object):
         buffer = [[] for i in range(len(self._fields))]
         self._rowcount = 0
         while True:
-            block, num_of_fields = CTaosInterface.fetchRow(self._result, self._fields)
+            block, num_of_fields = CTaosInterface.fetchRow(
+                self._result, self._fields)
             errno = CTaosInterface.libtaos.taos_errno(self._result)
             if errno != 0:
-                raise ProgrammingError(CTaosInterface.errStr(self._result), errno)
+                raise ProgrammingError(
+                    CTaosInterface.errStr(
+                        self._result), errno)
             if num_of_fields == 0:
                 break
             self._rowcount += num_of_fields
             for i in range(len(self._fields)):
                 buffer[i].extend(block[i])
         return list(map(tuple, zip(*buffer)))
+
     def fetchall(self):
         if self._result is None or self._fields is None:
             raise OperationalError("Invalid use of fetchall")
@@ -223,16 +228,20 @@ class TDengineCursor(object):
         buffer = [[] for i in range(len(self._fields))]
         self._rowcount = 0
         while True:
-            block, num_of_fields = CTaosInterface.fetchBlock(self._result, self._fields)
+            block, num_of_fields = CTaosInterface.fetchBlock(
+                self._result, self._fields)
             errno = CTaosInterface.libtaos.taos_errno(self._result)
             if errno != 0:
-                raise ProgrammingError(CTaosInterface.errStr(self._result), errno)
+                raise ProgrammingError(
+                    CTaosInterface.errStr(
+                        self._result), errno)
             if num_of_fields == 0:
                 break
             self._rowcount += num_of_fields
             for i in range(len(self._fields)):
                 buffer[i].extend(block[i])
         return list(map(tuple, zip(*buffer)))
+
     def nextset(self):
         """
         """

src/connector/python/linux/python2/taos/dbapi.py

@@ -4,6 +4,7 @@
 import time
 import datetime
 
+
 class DBAPITypeObject(object):
     def __init__(self, *values):
         self.values = values
@@ -16,19 +17,24 @@ class DBAPITypeObject(object):
         else:
             return -1
 
+
 Date = datetime.date
 Time = datetime.time
 Timestamp = datetime.datetime
 
+
 def DataFromTicks(ticks):
     return Date(*time.localtime(ticks)[:3])
 
+
 def TimeFromTicks(ticks):
     return Time(*time.localtime(ticks)[3:6])
 
+
 def TimestampFromTicks(ticks):
     return Timestamp(*time.localtime(ticks)[:6])
 
+
 Binary = bytes
 
 # STRING = DBAPITypeObject(*constants.FieldType.get_string_types())

src/connector/python/linux/python2/taos/error.py

 """Python exceptions
 """
 
+
 class Error(Exception):
     def __init__(self, msg=None, errno=None):
         self.msg = msg
@@ -10,26 +11,31 @@ class Error(Exception):
     def __str__(self):
         return self._full_msg
 
+
 class Warning(Exception):
     """Exception raised for important warnings like data truncations while inserting.
     """
     pass
 
+
 class InterfaceError(Error):
     """Exception raised for errors that are related to the database interface rather than the database itself.
     """
     pass
 
+
 class DatabaseError(Error):
     """Exception raised for errors that are related to the database.
     """
     pass
 
+
 class DataError(DatabaseError):
     """Exception raised for errors that are due to problems with the processed data like division by zero, numeric value out of range.
     """
     pass
 
+
 class OperationalError(DatabaseError):
     """Exception raised for errors that are related to the database's operation and not necessarily under the control of the programmer
     """
@@ -41,16 +47,19 @@ class IntegrityError(DatabaseError):
     """
     pass
 
+
 class InternalError(DatabaseError):
     """Exception raised when the database encounters an internal error.
     """
     pass
 
+
 class ProgrammingError(DatabaseError):
     """Exception raised for programming errors.
     """
     pass
 
+
 class NotSupportedError(DatabaseError):
     """Exception raised in case a method or database API was used which is not supported by the database,.
     """

src/connector/python/linux/python2/taos/subscription.py

 from .cinterface import CTaosInterface
 from .error import *
 
+
 class TDengineSubscription(object):
     """TDengine subscription object
     """
+
     def __init__(self, sub):
         self._sub = sub
 
-
     def consume(self):
         """Consume rows of a subscription
         """
@@ -18,15 +19,15 @@ class TDengineSubscription(object):
         buffer = [[] for i in range(len(fields))]
         while True:
             block, num_of_fields = CTaosInterface.fetchBlock(result, fields)
-            if num_of_fields == 0: break
+            if num_of_fields == 0:
+                break
             for i in range(len(fields)):
                 buffer[i].extend(block[i])
 
         self.fields = fields
         return list(map(tuple, zip(*buffer)))
 
-
-    def close(self, keepProgress = True):
+    def close(self, keepProgress=True):
         """Close the Subscription.
         """
         if self._sub is None:
@@ -38,12 +39,16 @@ class TDengineSubscription(object):
 
 if __name__ == '__main__':
     from .connection import TDengineConnection
-    conn = TDengineConnection(host="127.0.0.1", user="root", password="taosdata", database="test")
+    conn = TDengineConnection(
+        host="127.0.0.1",
+        user="root",
+        password="taosdata",
+        database="test")
 
     # Generate a cursor object to run SQL commands
     sub = conn.subscribe(True, "test", "select * from meters;", 1000)
 
-    for i in range(0,10):
+    for i in range(0, 10):
         data = sub.consume()
         for d in data:
             print(d)

src/connector/python/linux/python3/taos/__init__.py

@@ -8,6 +8,7 @@ paramstyle = 'pyformat'
 
 __all__ = ['connection', 'cursor']
 
+
 def connect(*args, **kwargs):
     """ Function to return a TDengine connector object
 

src/connector/python/linux/python3/taos/cinterface.py

@@ -4,11 +4,14 @@ from .error import *
 import math
 import datetime
 
+
 def _convert_millisecond_to_datetime(milli):
-    return datetime.datetime.fromtimestamp(milli/1000.0)
+    return datetime.datetime.fromtimestamp(milli / 1000.0)
+
 
 def _convert_microsecond_to_datetime(micro):
-    return datetime.datetime.fromtimestamp(micro/1000000.0)
+    return datetime.datetime.fromtimestamp(micro / 1000000.0)
+
 
 def _crow_timestamp_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bool row to python row
@@ -18,208 +21,309 @@ def _crow_timestamp_to_python(data, num_of_rows, nbytes=None, micro=False):
         _timestamp_converter = _convert_microsecond_to_datetime
 
     if num_of_rows > 0:
-        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
+        return list(map(_timestamp_converter, ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
     else:
-        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
+        return list(map(_timestamp_converter, ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
+
 
 def _crow_bool_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bool row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_byte))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_bool))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_bool))[
+                :abs(num_of_rows)]]
+
 
 def _crow_tinyint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C tinyint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)]]
+
 
-def _crow_tinyint_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
+def _crow_tinyint_unsigned_to_python(
+        data,
+        num_of_rows,
+        nbytes=None,
+        micro=False):
     """Function to convert C tinyint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_byte))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_byte))[
+                :abs(num_of_rows)]]
+
 
 def _crow_smallint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C smallint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)]]
+        return [
+            None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_short))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_short))[
+                :abs(num_of_rows)]]
 
-def _crow_smallint_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
+
+def _crow_smallint_unsigned_to_python(
+        data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C smallint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)]]
+        return [
+            None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_short))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_short))[
+                :abs(num_of_rows)]]
+
 
 def _crow_int_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C int row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)]]
+
 
 def _crow_int_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C int row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_int))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_int))[
+                :abs(num_of_rows)]]
+
 
 def _crow_bigint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bigint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]]
+
 
-def _crow_bigint_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
+def _crow_bigint_unsigned_to_python(
+        data,
+        num_of_rows,
+        nbytes=None,
+        micro=False):
     """Function to convert C bigint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_long))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_long))[
+                :abs(num_of_rows)]]
+
 
 def _crow_float_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C float row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)] ]
+        return [None if math.isnan(ele) else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)]]
     else:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)] ]
+        return [None if math.isnan(ele) else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)]]
+
 
 def _crow_double_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C double row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)] ]
+        return [None if math.isnan(ele) else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)]]
     else:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)] ]
+        return [None if math.isnan(ele) else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)]]
+
 
 def _crow_binary_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C binary row to python row
     """
     assert(nbytes is not None)
     if num_of_rows > 0:
-        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
+        return [None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode(
+            'utf-8') for ele in (ctypes.cast(data, ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
     else:
-        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
+        return [None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode(
+            'utf-8') for ele in (ctypes.cast(data, ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
+
 
 def _crow_nchar_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C nchar row to python row
     """
     assert(nbytes is not None)
-    res=[]
+    res = []
     for i in range(abs(num_of_rows)):
         try:
             if num_of_rows >= 0:
                 tmpstr = ctypes.c_char_p(data)
-                res.append( tmpstr.value.decode() )
+                res.append(tmpstr.value.decode())
             else:
-                res.append( (ctypes.cast(data+nbytes*i,  ctypes.POINTER(ctypes.c_wchar * (nbytes//4))))[0].value )
+                res.append((ctypes.cast(data + nbytes * i,
+                                        ctypes.POINTER(ctypes.c_wchar * (nbytes // 4))))[0].value)
         except ValueError:
             res.append(None)
 
     return res
 
+
 def _crow_binary_to_python_block(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C binary row to python row
     """
     assert(nbytes is not None)
-    res=[]
+    res = []
     if num_of_rows > 0:
         for i in range(abs(num_of_rows)):
             try:
-                rbyte=ctypes.cast(data+nbytes*i,ctypes.POINTER(ctypes.c_short))[:1].pop()
-                tmpstr = ctypes.c_char_p(data+nbytes*i+2)
-                res.append( tmpstr.value.decode()[0:rbyte] )
+                rbyte = ctypes.cast(
+                    data + nbytes * i,
+                    ctypes.POINTER(
+                        ctypes.c_short))[
+                    :1].pop()
+                tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
+                res.append(tmpstr.value.decode()[0:rbyte])
             except ValueError:
                 res.append(None)
     else:
         for i in range(abs(num_of_rows)):
             try:
-                rbyte=ctypes.cast(data+nbytes*i,ctypes.POINTER(ctypes.c_short))[:1].pop()
-                tmpstr = ctypes.c_char_p(data+nbytes*i+2)
-                res.append( tmpstr.value.decode()[0:rbyte] )
+                rbyte = ctypes.cast(
+                    data + nbytes * i,
+                    ctypes.POINTER(
+                        ctypes.c_short))[
+                    :1].pop()
+                tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
+                res.append(tmpstr.value.decode()[0:rbyte])
             except ValueError:
                 res.append(None)
     return res
 
+
 def _crow_nchar_to_python_block(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C nchar row to python row
     """
     assert(nbytes is not None)
-    res=[]
+    res = []
     if num_of_rows >= 0:
         for i in range(abs(num_of_rows)):
             try:
-                tmpstr = ctypes.c_char_p(data+nbytes*i+2)
-                res.append( tmpstr.value.decode() )
+                tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
+                res.append(tmpstr.value.decode())
             except ValueError:
                 res.append(None)
     else:
         for i in range(abs(num_of_rows)):
             try:
-                res.append( (ctypes.cast(data+nbytes*i+2,  ctypes.POINTER(ctypes.c_wchar * (nbytes//4))))[0].value )
+                res.append((ctypes.cast(data + nbytes * i + 2,
+                                        ctypes.POINTER(ctypes.c_wchar * (nbytes // 4))))[0].value)
             except ValueError:
                 res.append(None)
     return res
 
+
 _CONVERT_FUNC = {
     FieldType.C_BOOL: _crow_bool_to_python,
-    FieldType.C_TINYINT : _crow_tinyint_to_python,
-    FieldType.C_SMALLINT : _crow_smallint_to_python,
-    FieldType.C_INT : _crow_int_to_python,
-    FieldType.C_BIGINT : _crow_bigint_to_python,
-    FieldType.C_FLOAT : _crow_float_to_python,
-    FieldType.C_DOUBLE : _crow_double_to_python,
+    FieldType.C_TINYINT: _crow_tinyint_to_python,
+    FieldType.C_SMALLINT: _crow_smallint_to_python,
+    FieldType.C_INT: _crow_int_to_python,
+    FieldType.C_BIGINT: _crow_bigint_to_python,
+    FieldType.C_FLOAT: _crow_float_to_python,
+    FieldType.C_DOUBLE: _crow_double_to_python,
     FieldType.C_BINARY: _crow_binary_to_python,
-    FieldType.C_TIMESTAMP : _crow_timestamp_to_python,
-    FieldType.C_NCHAR : _crow_nchar_to_python,
-    FieldType.C_TINYINT_UNSIGNED : _crow_tinyint_unsigned_to_python,
-    FieldType.C_SMALLINT_UNSIGNED : _crow_smallint_unsigned_to_python,
-    FieldType.C_INT_UNSIGNED : _crow_int_unsigned_to_python,
-    FieldType.C_BIGINT_UNSIGNED : _crow_bigint_unsigned_to_python
+    FieldType.C_TIMESTAMP: _crow_timestamp_to_python,
+    FieldType.C_NCHAR: _crow_nchar_to_python,
+    FieldType.C_TINYINT_UNSIGNED: _crow_tinyint_unsigned_to_python,
+    FieldType.C_SMALLINT_UNSIGNED: _crow_smallint_unsigned_to_python,
+    FieldType.C_INT_UNSIGNED: _crow_int_unsigned_to_python,
+    FieldType.C_BIGINT_UNSIGNED: _crow_bigint_unsigned_to_python
 }
 
 _CONVERT_FUNC_BLOCK = {
     FieldType.C_BOOL: _crow_bool_to_python,
-    FieldType.C_TINYINT : _crow_tinyint_to_python,
-    FieldType.C_SMALLINT : _crow_smallint_to_python,
-    FieldType.C_INT : _crow_int_to_python,
-    FieldType.C_BIGINT : _crow_bigint_to_python,
-    FieldType.C_FLOAT : _crow_float_to_python,
-    FieldType.C_DOUBLE : _crow_double_to_python,
+    FieldType.C_TINYINT: _crow_tinyint_to_python,
+    FieldType.C_SMALLINT: _crow_smallint_to_python,
+    FieldType.C_INT: _crow_int_to_python,
+    FieldType.C_BIGINT: _crow_bigint_to_python,
+    FieldType.C_FLOAT: _crow_float_to_python,
+    FieldType.C_DOUBLE: _crow_double_to_python,
     FieldType.C_BINARY: _crow_binary_to_python_block,
-    FieldType.C_TIMESTAMP : _crow_timestamp_to_python,
-    FieldType.C_NCHAR : _crow_nchar_to_python_block,
-    FieldType.C_TINYINT_UNSIGNED : _crow_tinyint_unsigned_to_python,
-    FieldType.C_SMALLINT_UNSIGNED : _crow_smallint_unsigned_to_python,
-    FieldType.C_INT_UNSIGNED : _crow_int_unsigned_to_python,
-    FieldType.C_BIGINT_UNSIGNED : _crow_bigint_unsigned_to_python
+    FieldType.C_TIMESTAMP: _crow_timestamp_to_python,
+    FieldType.C_NCHAR: _crow_nchar_to_python_block,
+    FieldType.C_TINYINT_UNSIGNED: _crow_tinyint_unsigned_to_python,
+    FieldType.C_SMALLINT_UNSIGNED: _crow_smallint_unsigned_to_python,
+    FieldType.C_INT_UNSIGNED: _crow_int_unsigned_to_python,
+    FieldType.C_BIGINT_UNSIGNED: _crow_bigint_unsigned_to_python
 }
 
 # Corresponding TAOS_FIELD structure in C
+
+
 class TaosField(ctypes.Structure):
     _fields_ = [('name', ctypes.c_char * 65),
                 ('type', ctypes.c_char),
                 ('bytes', ctypes.c_short)]
 
 # C interface class
+
+
 class CTaosInterface(object):
 
     libtaos = ctypes.CDLL('libtaos.so')
@@ -256,7 +360,7 @@ class CTaosInterface(object):
             except AttributeError:
                 raise AttributeError("config is expected as a str")
 
-        if config != None:
+        if config is not None:
             CTaosInterface.libtaos.taos_options(3, self._config)
 
         CTaosInterface.libtaos.taos_init()
@@ -267,7 +371,13 @@ class CTaosInterface(object):
         """
         return self._config
 
-    def connect(self, host=None, user="root", password="taosdata", db=None, port=0):
+    def connect(
+            self,
+            host=None,
+            user="root",
+            password="taosdata",
+            db=None,
+            port=0):
         '''
         Function to connect to server
 
@@ -276,7 +386,7 @@ class CTaosInterface(object):
         # host
         try:
             _host = ctypes.c_char_p(host.encode(
-                "utf-8")) if host != None else ctypes.c_char_p(None)
+                "utf-8")) if host is not None else ctypes.c_char_p(None)
         except AttributeError:
             raise AttributeError("host is expected as a str")
 
@@ -295,7 +405,7 @@ class CTaosInterface(object):
         # db
         try:
             _db = ctypes.c_char_p(
-                db.encode("utf-8")) if db != None else ctypes.c_char_p(None)
+                db.encode("utf-8")) if db is not None else ctypes.c_char_p(None)
         except AttributeError:
             raise AttributeError("db is expected as a str")
 
@@ -308,11 +418,11 @@ class CTaosInterface(object):
         connection = ctypes.c_void_p(CTaosInterface.libtaos.taos_connect(
             _host, _user, _password, _db, _port))
 
-        if connection.value == None:
+        if connection.value is None:
             print('connect to TDengine failed')
             raise ConnectionError("connect to TDengine failed")
             # sys.exit(1)
-        #else:
+        # else:
         #    print('connect to TDengine success')
 
         return connection
@@ -333,7 +443,8 @@ class CTaosInterface(object):
         @rtype: 0 on success and -1 on failure
         '''
         try:
-            return CTaosInterface.libtaos.taos_query(connection, ctypes.c_char_p(sql.encode('utf-8')))
+            return CTaosInterface.libtaos.taos_query(
+                connection, ctypes.c_char_p(sql.encode('utf-8')))
         except AttributeError:
             raise AttributeError("sql is expected as a string")
         # finally:
@@ -400,35 +511,49 @@ class CTaosInterface(object):
             result, ctypes.byref(pblock))
         if num_of_rows == 0:
             return None, 0
-        isMicro = (CTaosInterface.libtaos.taos_result_precision(result) == FieldType.C_TIMESTAMP_MICRO)
+        isMicro = (CTaosInterface.libtaos.taos_result_precision(
+            result) == FieldType.C_TIMESTAMP_MICRO)
         blocks = [None] * len(fields)
         fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
-        fieldLen = [ele for ele in ctypes.cast(fieldL,  ctypes.POINTER(ctypes.c_int))[:len(fields)]]
+        fieldLen = [
+            ele for ele in ctypes.cast(
+                fieldL, ctypes.POINTER(
+                    ctypes.c_int))[
+                :len(fields)]]
         for i in range(len(fields)):
             data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
             if fields[i]['type'] not in _CONVERT_FUNC_BLOCK:
                 raise DatabaseError("Invalid data type returned from database")
-            blocks[i] = _CONVERT_FUNC_BLOCK[fields[i]['type']](data, num_of_rows, fieldLen[i], isMicro)
+            blocks[i] = _CONVERT_FUNC_BLOCK[fields[i]['type']](
+                data, num_of_rows, fieldLen[i], isMicro)
 
         return blocks, abs(num_of_rows)
+
     @staticmethod
     def fetchRow(result, fields):
         pblock = ctypes.c_void_p(0)
         pblock = CTaosInterface.libtaos.taos_fetch_row(result)
-        if pblock : 
+        if pblock:
             num_of_rows = 1
-            isMicro = (CTaosInterface.libtaos.taos_result_precision(result) == FieldType.C_TIMESTAMP_MICRO)
+            isMicro = (CTaosInterface.libtaos.taos_result_precision(
+                result) == FieldType.C_TIMESTAMP_MICRO)
             blocks = [None] * len(fields)
             fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
-            fieldLen = [ele for ele in ctypes.cast(fieldL,  ctypes.POINTER(ctypes.c_int))[:len(fields)]]
+            fieldLen = [
+                ele for ele in ctypes.cast(
+                    fieldL, ctypes.POINTER(
+                        ctypes.c_int))[
+                    :len(fields)]]
             for i in range(len(fields)):
                 data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
                 if fields[i]['type'] not in _CONVERT_FUNC:
-                    raise DatabaseError("Invalid data type returned from database")
+                    raise DatabaseError(
+                        "Invalid data type returned from database")
                 if data is None:
                     blocks[i] = [None]
                 else:
-                    blocks[i] = _CONVERT_FUNC[fields[i]['type']](data, num_of_rows, fieldLen[i], isMicro)         
+                    blocks[i] = _CONVERT_FUNC[fields[i]['type']](
+                        data, num_of_rows, fieldLen[i], isMicro)
         else:
             return None, 0
         return blocks, abs(num_of_rows)

src/connector/python/linux/python3/taos/connection.py

@@ -2,9 +2,11 @@ from .cursor import TDengineCursor
 from .subscription import TDengineSubscription
 from .cinterface import CTaosInterface
 
+
 class TDengineConnection(object):
     """ TDengine connection object
     """
+
     def __init__(self, *args, **kwargs):
         self._conn = None
         self._host = None
@@ -43,7 +45,12 @@ class TDengineConnection(object):
             self._config = kwargs['config']
 
         self._chandle = CTaosInterface(self._config)
-        self._conn = self._chandle.connect(self._host, self._user, self._password, self._database, self._port)
+        self._conn = self._chandle.connect(
+            self._host,
+            self._user,
+            self._password,
+            self._database,
+            self._port)
 
     def close(self):
         """Close current connection.
@@ -55,7 +62,8 @@ class TDengineConnection(object):
         """
         if self._conn is None:
             return None
-        sub = CTaosInterface.subscribe(self._conn, restart, topic, sql, interval)
+        sub = CTaosInterface.subscribe(
+            self._conn, restart, topic, sql, interval)
         return TDengineSubscription(sub)
 
     def cursor(self):
@@ -80,6 +88,7 @@ class TDengineConnection(object):
         """
         pass
 
+
 if __name__ == "__main__":
     conn = TDengineConnection(host='192.168.1.107')
     conn.close()

src/connector/python/linux/python3/taos/constants.py

@@ -3,6 +3,7 @@
 
 from .dbapi import *
 
+
 class FieldType(object):
     """TDengine Field Types
     """

src/connector/python/linux/python3/taos/cursor.py

@@ -5,6 +5,7 @@ import threading
 
 # querySeqNum = 0
 
+
 class TDengineCursor(object):
     """Database cursor which is used to manage the context of a fetch operation.
 
@@ -137,8 +138,8 @@ class TDengineCursor(object):
         if errno == 0:
             if CTaosInterface.fieldsCount(self._result) == 0:
                 self._affected_rows += CTaosInterface.affectedRows(
-                    self._result )
-                return CTaosInterface.affectedRows(self._result )
+                    self._result)
+                return CTaosInterface.affectedRows(self._result)
             else:
                 self._fields = CTaosInterface.useResult(
                     self._result)
@@ -216,10 +217,13 @@ class TDengineCursor(object):
         buffer = [[] for i in range(len(self._fields))]
         self._rowcount = 0
         while True:
-            block, num_of_fields = CTaosInterface.fetchRow(self._result, self._fields)
+            block, num_of_fields = CTaosInterface.fetchRow(
+                self._result, self._fields)
             errno = CTaosInterface.libtaos.taos_errno(self._result)
             if errno != 0:
-                raise ProgrammingError(CTaosInterface.errStr(self._result), errno)
+                raise ProgrammingError(
+                    CTaosInterface.errStr(
+                        self._result), errno)
             if num_of_fields == 0:
                 break
             self._rowcount += num_of_fields
@@ -234,15 +238,20 @@ class TDengineCursor(object):
         buffer = [[] for i in range(len(self._fields))]
         self._rowcount = 0
         while True:
-            block, num_of_fields = CTaosInterface.fetchBlock(self._result, self._fields)
+            block, num_of_fields = CTaosInterface.fetchBlock(
+                self._result, self._fields)
             errno = CTaosInterface.libtaos.taos_errno(self._result)
             if errno != 0:
-                raise ProgrammingError(CTaosInterface.errStr(self._result), errno)
-            if num_of_fields == 0: break
+                raise ProgrammingError(
+                    CTaosInterface.errStr(
+                        self._result), errno)
+            if num_of_fields == 0:
+                break
             self._rowcount += num_of_fields
             for i in range(len(self._fields)):
                 buffer[i].extend(block[i])
         return list(map(tuple, zip(*buffer)))
+
     def nextset(self):
         """
         """
@@ -283,4 +292,3 @@ class TDengineCursor(object):
                 (ele['name'], ele['type'], None, None, None, None, False))
 
         return self._result
-

src/connector/python/linux/python3/taos/dbapi.py

@@ -4,6 +4,7 @@
 import time
 import datetime
 
+
 class DBAPITypeObject(object):
     def __init__(self, *values):
         self.values = values
@@ -16,19 +17,24 @@ class DBAPITypeObject(object):
         else:
             return -1
 
+
 Date = datetime.date
 Time = datetime.time
 Timestamp = datetime.datetime
 
+
 def DataFromTicks(ticks):
     return Date(*time.localtime(ticks)[:3])
 
+
 def TimeFromTicks(ticks):
     return Time(*time.localtime(ticks)[3:6])
 
+
 def TimestampFromTicks(ticks):
     return Timestamp(*time.localtime(ticks)[:6])
 
+
 Binary = bytes
 
 # STRING = DBAPITypeObject(*constants.FieldType.get_string_types())

src/connector/python/linux/python3/taos/error.py

 """Python exceptions
 """
 
+
 class Error(Exception):
     def __init__(self, msg=None, errno=None):
         self.msg = msg
@@ -10,26 +11,31 @@ class Error(Exception):
     def __str__(self):
         return self._full_msg
 
+
 class Warning(Exception):
     """Exception raised for important warnings like data truncations while inserting.
     """
     pass
 
+
 class InterfaceError(Error):
     """Exception raised for errors that are related to the database interface rather than the database itself.
     """
     pass
 
+
 class DatabaseError(Error):
     """Exception raised for errors that are related to the database.
     """
     pass
 
+
 class DataError(DatabaseError):
     """Exception raised for errors that are due to problems with the processed data like division by zero, numeric value out of range.
     """
     pass
 
+
 class OperationalError(DatabaseError):
     """Exception raised for errors that are related to the database's operation and not necessarily under the control of the programmer
     """
@@ -41,16 +47,19 @@ class IntegrityError(DatabaseError):
     """
     pass
 
+
 class InternalError(DatabaseError):
     """Exception raised when the database encounters an internal error.
     """
     pass
 
+
 class ProgrammingError(DatabaseError):
     """Exception raised for programming errors.
     """
     pass
 
+
 class NotSupportedError(DatabaseError):
     """Exception raised in case a method or database API was used which is not supported by the database,.
     """

src/connector/python/linux/python3/taos/subscription.py

 from .cinterface import CTaosInterface
 from .error import *
 
+
 class TDengineSubscription(object):
     """TDengine subscription object
     """
+
     def __init__(self, sub):
         self._sub = sub
 
-
     def consume(self):
         """Consume rows of a subscription
         """
@@ -18,15 +19,15 @@ class TDengineSubscription(object):
         buffer = [[] for i in range(len(fields))]
         while True:
             block, num_of_fields = CTaosInterface.fetchBlock(result, fields)
-            if num_of_fields == 0: break
+            if num_of_fields == 0:
+                break
             for i in range(len(fields)):
                 buffer[i].extend(block[i])
 
         self.fields = fields
         return list(map(tuple, zip(*buffer)))
 
-
-    def close(self, keepProgress = True):
+    def close(self, keepProgress=True):
         """Close the Subscription.
         """
         if self._sub is None:
@@ -38,12 +39,16 @@ class TDengineSubscription(object):
 
 if __name__ == '__main__':
     from .connection import TDengineConnection
-    conn = TDengineConnection(host="127.0.0.1", user="root", password="taosdata", database="test")
+    conn = TDengineConnection(
+        host="127.0.0.1",
+        user="root",
+        password="taosdata",
+        database="test")
 
     # Generate a cursor object to run SQL commands
     sub = conn.subscribe(True, "test", "select * from meters;", 1000)
 
-    for i in range(0,10):
+    for i in range(0, 10):
         data = sub.consume()
         for d in data:
             print(d)

src/connector/python/osx/python3/taos/__init__.py

@@ -8,6 +8,7 @@ paramstyle = 'pyformat'
 
 __all__ = ['connection', 'cursor']
 
+
 def connect(*args, **kwargs):
     """ Function to return a TDengine connector object
 

src/connector/python/osx/python3/taos/cinterface.py

@@ -4,11 +4,14 @@ from .error import *
 import math
 import datetime
 
+
 def _convert_millisecond_to_datetime(milli):
-    return datetime.datetime.fromtimestamp(milli/1000.0)
+    return datetime.datetime.fromtimestamp(milli / 1000.0)
+
 
 def _convert_microsecond_to_datetime(micro):
-    return datetime.datetime.fromtimestamp(micro/1000000.0)
+    return datetime.datetime.fromtimestamp(micro / 1000000.0)
+
 
 def _crow_timestamp_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bool row to python row
@@ -18,208 +21,309 @@ def _crow_timestamp_to_python(data, num_of_rows, nbytes=None, micro=False):
         _timestamp_converter = _convert_microsecond_to_datetime
 
     if num_of_rows > 0:
-        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
+        return list(map(_timestamp_converter, ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
     else:
-        return list(map(_timestamp_converter, ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
+        return list(map(_timestamp_converter, ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]))
+
 
 def _crow_bool_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bool row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_byte))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_bool))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_BOOL_NULL else bool(ele) for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_bool))[
+                :abs(num_of_rows)]]
+
 
 def _crow_tinyint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C tinyint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_TINYINT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)]]
+
 
-def _crow_tinyint_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
+def _crow_tinyint_unsigned_to_python(
+        data,
+        num_of_rows,
+        nbytes=None,
+        micro=False):
     """Function to convert C tinyint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_byte))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_byte))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_TINYINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_byte))[
+                :abs(num_of_rows)]]
+
 
 def _crow_smallint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C smallint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)]]
+        return [
+            None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_short))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_SMALLINT_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_short))[
+                :abs(num_of_rows)]]
 
-def _crow_smallint_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
+
+def _crow_smallint_unsigned_to_python(
+        data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C smallint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)]]
+        return [
+            None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_short))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_short))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_SMALLINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_short))[
+                :abs(num_of_rows)]]
+
 
 def _crow_int_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C int row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_INT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)]]
+
 
 def _crow_int_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C int row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_int))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_int))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_INT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_int))[
+                :abs(num_of_rows)]]
+
 
 def _crow_bigint_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C bigint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
+        return [None if ele == FieldType.C_BIGINT_NULL else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)]]
+
 
-def _crow_bigint_unsigned_to_python(data, num_of_rows, nbytes=None, micro=False):
+def _crow_bigint_unsigned_to_python(
+        data,
+        num_of_rows,
+        nbytes=None,
+        micro=False):
     """Function to convert C bigint row to python row
     """
     if num_of_rows > 0:
-        return [ None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_long))[
+                :abs(num_of_rows)]]
     else:
-        return [ None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_long))[:abs(num_of_rows)] ]
+        return [
+            None if ele == FieldType.C_BIGINT_UNSIGNED_NULL else ele for ele in ctypes.cast(
+                data, ctypes.POINTER(
+                    ctypes.c_long))[
+                :abs(num_of_rows)]]
+
 
 def _crow_float_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C float row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)] ]
+        return [None if math.isnan(ele) else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)]]
     else:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)] ]
+        return [None if math.isnan(ele) else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_float))[:abs(num_of_rows)]]
+
 
 def _crow_double_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C double row to python row
     """
     if num_of_rows > 0:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)] ]
+        return [None if math.isnan(ele) else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)]]
     else:
-        return [ None if math.isnan(ele) else ele for ele in ctypes.cast(data,  ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)] ]
+        return [None if math.isnan(ele) else ele for ele in ctypes.cast(
+            data, ctypes.POINTER(ctypes.c_double))[:abs(num_of_rows)]]
+
 
 def _crow_binary_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C binary row to python row
     """
     assert(nbytes is not None)
     if num_of_rows > 0:
-        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
+        return [None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode(
+            'utf-8') for ele in (ctypes.cast(data, ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
     else:
-        return [ None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode('utf-8') for ele in (ctypes.cast(data,  ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
+        return [None if ele.value[0:1] == FieldType.C_BINARY_NULL else ele.value.decode(
+            'utf-8') for ele in (ctypes.cast(data, ctypes.POINTER(ctypes.c_char * nbytes)))[:abs(num_of_rows)]]
+
 
 def _crow_nchar_to_python(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C nchar row to python row
     """
     assert(nbytes is not None)
-    res=[]
+    res = []
     for i in range(abs(num_of_rows)):
         try:
             if num_of_rows >= 0:
                 tmpstr = ctypes.c_char_p(data)
-                res.append( tmpstr.value.decode() )
+                res.append(tmpstr.value.decode())
             else:
-                res.append( (ctypes.cast(data+nbytes*i,  ctypes.POINTER(ctypes.c_wchar * (nbytes//4))))[0].value )
+                res.append((ctypes.cast(data + nbytes * i,
+                                        ctypes.POINTER(ctypes.c_wchar * (nbytes // 4))))[0].value)
         except ValueError:
             res.append(None)
 
     return res
 
+
 def _crow_binary_to_python_block(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C binary row to python row
     """
     assert(nbytes is not None)
-    res=[]
+    res = []
     if num_of_rows > 0:
         for i in range(abs(num_of_rows)):
             try:
-                rbyte=ctypes.cast(data+nbytes*i,ctypes.POINTER(ctypes.c_short))[:1].pop()
-                tmpstr = ctypes.c_char_p(data+nbytes*i+2)
-                res.append( tmpstr.value.decode()[0:rbyte] )
+                rbyte = ctypes.cast(
+                    data + nbytes * i,
+                    ctypes.POINTER(
+                        ctypes.c_short))[
+                    :1].pop()
+                tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
+                res.append(tmpstr.value.decode()[0:rbyte])
             except ValueError:
                 res.append(None)
     else:
         for i in range(abs(num_of_rows)):
             try:
-                rbyte=ctypes.cast(data+nbytes*i,ctypes.POINTER(ctypes.c_short))[:1].pop()
-                tmpstr = ctypes.c_char_p(data+nbytes*i+2)
-                res.append( tmpstr.value.decode()[0:rbyte] )
+                rbyte = ctypes.cast(
+                    data + nbytes * i,
+                    ctypes.POINTER(
+                        ctypes.c_short))[
+                    :1].pop()
+                tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
+                res.append(tmpstr.value.decode()[0:rbyte])
             except ValueError:
                 res.append(None)
     return res
 
+
 def _crow_nchar_to_python_block(data, num_of_rows, nbytes=None, micro=False):
     """Function to convert C nchar row to python row
     """
     assert(nbytes is not None)
-    res=[]
+    res = []
     if num_of_rows >= 0:
         for i in range(abs(num_of_rows)):
             try:
-                tmpstr = ctypes.c_char_p(data+nbytes*i+2)
-                res.append( tmpstr.value.decode() )
+                tmpstr = ctypes.c_char_p(data + nbytes * i + 2)
+                res.append(tmpstr.value.decode())
             except ValueError:
                 res.append(None)
     else:
         for i in range(abs(num_of_rows)):
             try:
-                res.append( (ctypes.cast(data+nbytes*i+2,  ctypes.POINTER(ctypes.c_wchar * (nbytes//4))))[0].value )
+                res.append((ctypes.cast(data + nbytes * i + 2,
+                                        ctypes.POINTER(ctypes.c_wchar * (nbytes // 4))))[0].value)
             except ValueError:
                 res.append(None)
     return res
 
+
 _CONVERT_FUNC = {
     FieldType.C_BOOL: _crow_bool_to_python,
-    FieldType.C_TINYINT : _crow_tinyint_to_python,
-    FieldType.C_SMALLINT : _crow_smallint_to_python,
-    FieldType.C_INT : _crow_int_to_python,
-    FieldType.C_BIGINT : _crow_bigint_to_python,
-    FieldType.C_FLOAT : _crow_float_to_python,
-    FieldType.C_DOUBLE : _crow_double_to_python,
+    FieldType.C_TINYINT: _crow_tinyint_to_python,
+    FieldType.C_SMALLINT: _crow_smallint_to_python,
+    FieldType.C_INT: _crow_int_to_python,
+    FieldType.C_BIGINT: _crow_bigint_to_python,
+    FieldType.C_FLOAT: _crow_float_to_python,
+    FieldType.C_DOUBLE: _crow_double_to_python,
     FieldType.C_BINARY: _crow_binary_to_python,
-    FieldType.C_TIMESTAMP : _crow_timestamp_to_python,
-    FieldType.C_NCHAR : _crow_nchar_to_python,
-    FieldType.C_TINYINT_UNSIGNED : _crow_tinyint_unsigned_to_python,
-    FieldType.C_SMALLINT_UNSIGNED : _crow_smallint_unsigned_to_python,
-    FieldType.C_INT_UNSIGNED : _crow_int_unsigned_to_python,
-    FieldType.C_BIGINT_UNSIGNED : _crow_bigint_unsigned_to_python
+    FieldType.C_TIMESTAMP: _crow_timestamp_to_python,
+    FieldType.C_NCHAR: _crow_nchar_to_python,
+    FieldType.C_TINYINT_UNSIGNED: _crow_tinyint_unsigned_to_python,
+    FieldType.C_SMALLINT_UNSIGNED: _crow_smallint_unsigned_to_python,
+    FieldType.C_INT_UNSIGNED: _crow_int_unsigned_to_python,
+    FieldType.C_BIGINT_UNSIGNED: _crow_bigint_unsigned_to_python
 }
 
 _CONVERT_FUNC_BLOCK = {
     FieldType.C_BOOL: _crow_bool_to_python,
-    FieldType.C_TINYINT : _crow_tinyint_to_python,
-    FieldType.C_SMALLINT : _crow_smallint_to_python,
-    FieldType.C_INT : _crow_int_to_python,
-    FieldType.C_BIGINT : _crow_bigint_to_python,
-    FieldType.C_FLOAT : _crow_float_to_python,
-    FieldType.C_DOUBLE : _crow_double_to_python,
+    FieldType.C_TINYINT: _crow_tinyint_to_python,
+    FieldType.C_SMALLINT: _crow_smallint_to_python,
+    FieldType.C_INT: _crow_int_to_python,
+    FieldType.C_BIGINT: _crow_bigint_to_python,
+    FieldType.C_FLOAT: _crow_float_to_python,
+    FieldType.C_DOUBLE: _crow_double_to_python,
     FieldType.C_BINARY: _crow_binary_to_python_block,
-    FieldType.C_TIMESTAMP : _crow_timestamp_to_python,
-    FieldType.C_NCHAR : _crow_nchar_to_python_block,
-    FieldType.C_TINYINT_UNSIGNED : _crow_tinyint_unsigned_to_python,
-    FieldType.C_SMALLINT_UNSIGNED : _crow_smallint_unsigned_to_python,
-    FieldType.C_INT_UNSIGNED : _crow_int_unsigned_to_python,
-    FieldType.C_BIGINT_UNSIGNED : _crow_bigint_unsigned_to_python
+    FieldType.C_TIMESTAMP: _crow_timestamp_to_python,
+    FieldType.C_NCHAR: _crow_nchar_to_python_block,
+    FieldType.C_TINYINT_UNSIGNED: _crow_tinyint_unsigned_to_python,
+    FieldType.C_SMALLINT_UNSIGNED: _crow_smallint_unsigned_to_python,
+    FieldType.C_INT_UNSIGNED: _crow_int_unsigned_to_python,
+    FieldType.C_BIGINT_UNSIGNED: _crow_bigint_unsigned_to_python
 }
 
 # Corresponding TAOS_FIELD structure in C
+
+
 class TaosField(ctypes.Structure):
     _fields_ = [('name', ctypes.c_char * 65),
                 ('type', ctypes.c_char),
                 ('bytes', ctypes.c_short)]
 
 # C interface class
+
+
 class CTaosInterface(object):
 
     libtaos = ctypes.CDLL('libtaos.dylib')
@@ -256,7 +360,7 @@ class CTaosInterface(object):
             except AttributeError:
                 raise AttributeError("config is expected as a str")
 
-        if config != None:
+        if config is not None:
             CTaosInterface.libtaos.taos_options(3, self._config)
 
         CTaosInterface.libtaos.taos_init()
@@ -267,7 +371,13 @@ class CTaosInterface(object):
         """
         return self._config
 
-    def connect(self, host=None, user="root", password="taosdata", db=None, port=0):
+    def connect(
+            self,
+            host=None,
+            user="root",
+            password="taosdata",
+            db=None,
+            port=0):
         '''
         Function to connect to server
 
@@ -276,7 +386,7 @@ class CTaosInterface(object):
         # host
         try:
             _host = ctypes.c_char_p(host.encode(
-                "utf-8")) if host != None else ctypes.c_char_p(None)
+                "utf-8")) if host is not None else ctypes.c_char_p(None)
         except AttributeError:
             raise AttributeError("host is expected as a str")
 
@@ -295,7 +405,7 @@ class CTaosInterface(object):
         # db
         try:
             _db = ctypes.c_char_p(
-                db.encode("utf-8")) if db != None else ctypes.c_char_p(None)
+                db.encode("utf-8")) if db is not None else ctypes.c_char_p(None)
         except AttributeError:
             raise AttributeError("db is expected as a str")
 
@@ -308,11 +418,11 @@ class CTaosInterface(object):
         connection = ctypes.c_void_p(CTaosInterface.libtaos.taos_connect(
             _host, _user, _password, _db, _port))
 
-        if connection.value == None:
+        if connection.value is None:
             print('connect to TDengine failed')
             raise ConnectionError("connect to TDengine failed")
             # sys.exit(1)
-        #else:
+        # else:
         #    print('connect to TDengine success')
 
         return connection
@@ -333,7 +443,8 @@ class CTaosInterface(object):
         @rtype: 0 on success and -1 on failure
         '''
         try:
-            return CTaosInterface.libtaos.taos_query(connection, ctypes.c_char_p(sql.encode('utf-8')))
+            return CTaosInterface.libtaos.taos_query(
+                connection, ctypes.c_char_p(sql.encode('utf-8')))
         except AttributeError:
             raise AttributeError("sql is expected as a string")
         # finally:
@@ -400,35 +511,49 @@ class CTaosInterface(object):
             result, ctypes.byref(pblock))
         if num_of_rows == 0:
             return None, 0
-        isMicro = (CTaosInterface.libtaos.taos_result_precision(result) == FieldType.C_TIMESTAMP_MICRO)
+        isMicro = (CTaosInterface.libtaos.taos_result_precision(
+            result) == FieldType.C_TIMESTAMP_MICRO)
         blocks = [None] * len(fields)
         fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
-        fieldLen = [ele for ele in ctypes.cast(fieldL,  ctypes.POINTER(ctypes.c_int))[:len(fields)]]
+        fieldLen = [
+            ele for ele in ctypes.cast(
+                fieldL, ctypes.POINTER(
+                    ctypes.c_int))[
+                :len(fields)]]
         for i in range(len(fields)):
             data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
             if fields[i]['type'] not in _CONVERT_FUNC_BLOCK:
                 raise DatabaseError("Invalid data type returned from database")
-            blocks[i] = _CONVERT_FUNC_BLOCK[fields[i]['type']](data, num_of_rows, fieldLen[i], isMicro)
+            blocks[i] = _CONVERT_FUNC_BLOCK[fields[i]['type']](
+                data, num_of_rows, fieldLen[i], isMicro)
 
         return blocks, abs(num_of_rows)
+
     @staticmethod
     def fetchRow(result, fields):
         pblock = ctypes.c_void_p(0)
         pblock = CTaosInterface.libtaos.taos_fetch_row(result)
-        if pblock : 
+        if pblock:
             num_of_rows = 1
-            isMicro = (CTaosInterface.libtaos.taos_result_precision(result) == FieldType.C_TIMESTAMP_MICRO)
+            isMicro = (CTaosInterface.libtaos.taos_result_precision(
+                result) == FieldType.C_TIMESTAMP_MICRO)
             blocks = [None] * len(fields)
             fieldL = CTaosInterface.libtaos.taos_fetch_lengths(result)
-            fieldLen = [ele for ele in ctypes.cast(fieldL,  ctypes.POINTER(ctypes.c_int))[:len(fields)]]
+            fieldLen = [
+                ele for ele in ctypes.cast(
+                    fieldL, ctypes.POINTER(
+                        ctypes.c_int))[
+                    :len(fields)]]
             for i in range(len(fields)):
                 data = ctypes.cast(pblock, ctypes.POINTER(ctypes.c_void_p))[i]
                 if fields[i]['type'] not in _CONVERT_FUNC:
-                    raise DatabaseError("Invalid data type returned from database")
+                    raise DatabaseError(
+                        "Invalid data type returned from database")
                 if data is None:
                     blocks[i] = [None]
                 else:
-                    blocks[i] = _CONVERT_FUNC[fields[i]['type']](data, num_of_rows, fieldLen[i], isMicro)         
+                    blocks[i] = _CONVERT_FUNC[fields[i]['type']](
+                        data, num_of_rows, fieldLen[i], isMicro)
         else:
             return None, 0
         return blocks, abs(num_of_rows)

src/connector/python/osx/python3/taos/connection.py

@@ -2,9 +2,11 @@ from .cursor import TDengineCursor
 from .subscription import TDengineSubscription
 from .cinterface import CTaosInterface
 
+
 class TDengineConnection(object):
     """ TDengine connection object
     """
+
     def __init__(self, *args, **kwargs):
         self._conn = None
         self._host = None
@@ -43,7 +45,12 @@ class TDengineConnection(object):
             self._config = kwargs['config']
 
         self._chandle = CTaosInterface(self._config)
-        self._conn = self._chandle.connect(self._host, self._user, self._password, self._database, self._port)
+        self._conn = self._chandle.connect(
+            self._host,
+            self._user,
+            self._password,
+            self._database,
+            self._port)
 
     def close(self):
         """Close current connection.
@@ -55,7 +62,8 @@ class TDengineConnection(object):
         """
         if self._conn is None:
             return None
-        sub = CTaosInterface.subscribe(self._conn, restart, topic, sql, interval)
+        sub = CTaosInterface.subscribe(
+            self._conn, restart, topic, sql, interval)
         return TDengineSubscription(sub)
 
     def cursor(self):
@@ -80,6 +88,7 @@ class TDengineConnection(object):
         """
         pass
 
+
 if __name__ == "__main__":
     conn = TDengineConnection(host='192.168.1.107')
     conn.close()

src/connector/python/osx/python3/taos/constants.py

@@ -3,6 +3,7 @@
 
 from .dbapi import *
 
+
 class FieldType(object):
     """TDengine Field Types
     """

src/connector/python/osx/python3/taos/cursor.py

@@ -5,6 +5,7 @@ import threading
 
 # querySeqNum = 0
 
+
 class TDengineCursor(object):
     """Database cursor which is used to manage the context of a fetch operation.
 
@@ -137,8 +138,8 @@ class TDengineCursor(object):
         if errno == 0:
             if CTaosInterface.fieldsCount(self._result) == 0:
                 self._affected_rows += CTaosInterface.affectedRows(
-                    self._result )
-                return CTaosInterface.affectedRows(self._result )
+                    self._result)
+                return CTaosInterface.affectedRows(self._result)
             else:
                 self._fields = CTaosInterface.useResult(
                     self._result)
@@ -216,10 +217,13 @@ class TDengineCursor(object):
         buffer = [[] for i in range(len(self._fields))]
         self._rowcount = 0
         while True:
-            block, num_of_fields = CTaosInterface.fetchRow(self._result, self._fields)
+            block, num_of_fields = CTaosInterface.fetchRow(
+                self._result, self._fields)
             errno = CTaosInterface.libtaos.taos_errno(self._result)
             if errno != 0:
-                raise ProgrammingError(CTaosInterface.errStr(self._result), errno)
+                raise ProgrammingError(
+                    CTaosInterface.errStr(
+                        self._result), errno)
             if num_of_fields == 0:
                 break
             self._rowcount += num_of_fields
@@ -234,15 +238,20 @@ class TDengineCursor(object):
         buffer = [[] for i in range(len(self._fields))]
         self._rowcount = 0
         while True:
-            block, num_of_fields = CTaosInterface.fetchBlock(self._result, self._fields)
+            block, num_of_fields = CTaosInterface.fetchBlock(
+                self._result, self._fields)
             errno = CTaosInterface.libtaos.taos_errno(self._result)
             if errno != 0:
-                raise ProgrammingError(CTaosInterface.errStr(self._result), errno)
-            if num_of_fields == 0: break
+                raise ProgrammingError(
+                    CTaosInterface.errStr(
+                        self._result), errno)
+            if num_of_fields == 0:
+                break
             self._rowcount += num_of_fields
             for i in range(len(self._fields)):
                 buffer[i].extend(block[i])
         return list(map(tuple, zip(*buffer)))
+
     def nextset(self):
         """
         """
@@ -283,4 +292,3 @@ class TDengineCursor(object):
                 (ele['name'], ele['type'], None, None, None, None, False))
 
         return self._result
-

src/connector/python/osx/python3/taos/dbapi.py

@@ -4,6 +4,7 @@
 import time
 import datetime
 
+
 class DBAPITypeObject(object):
     def __init__(self, *values):
         self.values = values
@@ -16,19 +17,24 @@ class DBAPITypeObject(object):
         else:
             return -1
 
+
 Date = datetime.date
 Time = datetime.time
 Timestamp = datetime.datetime
 
+
 def DataFromTicks(ticks):
     return Date(*time.localtime(ticks)[:3])
 
+
 def TimeFromTicks(ticks):
     return Time(*time.localtime(ticks)[3:6])
 
+
 def TimestampFromTicks(ticks):
     return Timestamp(*time.localtime(ticks)[:6])
 
+
 Binary = bytes
 
 # STRING = DBAPITypeObject(*constants.FieldType.get_string_types())

src/connector/python/osx/python3/taos/error.py

 """Python exceptions
 """
 
+
 class Error(Exception):
     def __init__(self, msg=None, errno=None):
         self.msg = msg
@@ -10,26 +11,31 @@ class Error(Exception):
     def __str__(self):
         return self._full_msg
 
+
 class Warning(Exception):
     """Exception raised for important warnings like data truncations while inserting.
     """
     pass
 
+
 class InterfaceError(Error):
     """Exception raised for errors that are related to the database interface rather than the database itself.
     """
     pass
 
+
 class DatabaseError(Error):
     """Exception raised for errors that are related to the database.
     """
     pass
 
+
 class DataError(DatabaseError):
     """Exception raised for errors that are due to problems with the processed data like division by zero, numeric value out of range.
     """
     pass
 
+
 class OperationalError(DatabaseError):
     """Exception raised for errors that are related to the database's operation and not necessarily under the control of the programmer
     """
@@ -41,16 +47,19 @@ class IntegrityError(DatabaseError):
     """
     pass
 
+
 class InternalError(DatabaseError):
     """Exception raised when the database encounters an internal error.
     """
     pass
 
+
 class ProgrammingError(DatabaseError):
     """Exception raised for programming errors.
     """
     pass
 
+
 class NotSupportedError(DatabaseError):
     """Exception raised in case a method or database API was used which is not supported by the database,.
     """

src/connector/python/osx/python3/taos/subscription.py

 from .cinterface import CTaosInterface
 from .error import *
 
+
 class TDengineSubscription(object):
     """TDengine subscription object
     """
+
     def __init__(self, sub):
         self._sub = sub
 
-
     def consume(self):
         """Consume rows of a subscription
         """
@@ -18,15 +19,15 @@ class TDengineSubscription(object):
         buffer = [[] for i in range(len(fields))]
         while True:
             block, num_of_fields = CTaosInterface.fetchBlock(result, fields)
-            if num_of_fields == 0: break
+            if num_of_fields == 0:
+                break
             for i in range(len(fields)):
                 buffer[i].extend(block[i])
 
         self.fields = fields
         return list(map(tuple, zip(*buffer)))
 
-
-    def close(self, keepProgress = True):
+    def close(self, keepProgress=True):
         """Close the Subscription.
         """
         if self._sub is None:
@@ -38,12 +39,16 @@ class TDengineSubscription(object):
 
 if __name__ == '__main__':
     from .connection import TDengineConnection
-    conn = TDengineConnection(host="127.0.0.1", user="root", password="taosdata", database="test")
+    conn = TDengineConnection(
+        host="127.0.0.1",
+        user="root",
+        password="taosdata",
+        database="test")
 
     # Generate a cursor object to run SQL commands
     sub = conn.subscribe(True, "test", "select * from meters;", 1000)
 
-    for i in range(0,10):
+    for i in range(0, 10):
         data = sub.consume()
         for d in data:
             print(d)

tests/pytest/insert/basic_unsigned.py

@@ -25,7 +25,8 @@ class TDTestCase:
     def run(self):
         tdSql.prepare()
 
-        ret = tdSql.execute('create table tb (ts timestamp, speed int unsigned)')
+        ret = tdSql.execute(
+            'create table tb (ts timestamp, speed int unsigned)')
 
         insertRows = 10
         tdLog.info("insert %d rows" % (insertRows))