diff --git a/src/connector/python/linux/python2/setup.py b/src/connector/python/linux/python2/setup.py
index b3daa98bdce79adc479ac4c529bb2d2f4fe36696..92a931b504fd76d12c1a4094a04fed4f859c0a3e 100644
--- a/src/connector/python/linux/python2/setup.py
+++ b/src/connector/python/linux/python2/setup.py
@@ -5,7 +5,7 @@ with open("README.md", "r") as fh:
 
 setuptools.setup(
     name="taos",
-    version="2.0.2",
+    version="2.0.3",
     author="Taosdata Inc.",
     author_email="support@taosdata.com",
     description="TDengine python client package",
diff --git a/src/connector/python/linux/python2/taos/__init__.py b/src/connector/python/linux/python2/taos/__init__.py
index 4894488bc8d4e594c11a8be61fbea278ca2588fa..62e0536b6fca63a0aca0b6be3673104c27c631c6 100644
--- a/src/connector/python/linux/python2/taos/__init__.py
+++ b/src/connector/python/linux/python2/taos/__init__.py
@@ -3,7 +3,7 @@ from .connection import TDengineConnection
 from .cursor import TDengineCursor
 
 # Globals
-apilevel = '2.0'
+apilevel = '2.0.3'
 threadsafety = 0
 paramstyle = 'pyformat'
 
diff --git a/src/connector/python/linux/python2/taos/cinterface.py b/src/connector/python/linux/python2/taos/cinterface.py
index 6f0435722ffba7a3cf6e2fb22591b1d037397156..2b1b29ee31af56499d626fc56d4950e2e25f9978 100644
--- a/src/connector/python/linux/python2/taos/cinterface.py
+++ b/src/connector/python/linux/python2/taos/cinterface.py
@@ -81,6 +81,7 @@ def _crow_double_to_python(data, num_of_rows, nbytes=None, micro=False):
 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)]]
     else:
@@ -106,6 +107,7 @@ def _crow_nchar_to_python(data, num_of_rows, nbytes=None, micro=False):
 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=[]
     if num_of_rows > 0:
         for i in range(abs(num_of_rows)):
diff --git a/src/connector/python/linux/python2/taos/cursor.py b/src/connector/python/linux/python2/taos/cursor.py
index eee5e3948894b710217038f6e52db24a96212d60..82a01be67118813f9c83c3c3870d91535e13c526 100644
--- a/src/connector/python/linux/python2/taos/cursor.py
+++ b/src/connector/python/linux/python2/taos/cursor.py
@@ -26,7 +26,7 @@ class TDengineCursor(object):
     """
 
     def __init__(self, connection=None):
-        self._description = None
+        self._description = []
         self._rowcount = -1
         self._connection = None
         self._result = None
@@ -234,7 +234,7 @@ class TDengineCursor(object):
     def _reset_result(self):
         """Reset the result to unused version.
         """
-        self._description = None
+        self._description = []
         self._rowcount = -1
         if self._result is not None:
             CTaosInterface.freeResult(self._result)
diff --git a/src/connector/python/linux/python3/setup.py b/src/connector/python/linux/python3/setup.py
index f49ebe2b6d188bf8c25623fbdde4c610a6b66231..655a12ad135e4eae575061e6069724a12a2a6996 100644
--- a/src/connector/python/linux/python3/setup.py
+++ b/src/connector/python/linux/python3/setup.py
@@ -5,7 +5,7 @@ with open("README.md", "r") as fh:
 
 setuptools.setup(
     name="taos",
-    version="2.0.2",
+    version="2.0.3",
     author="Taosdata Inc.",
     author_email="support@taosdata.com",
     description="TDengine python client package",
diff --git a/src/connector/python/linux/python3/taos/__init__.py b/src/connector/python/linux/python3/taos/__init__.py
index 4894488bc8d4e594c11a8be61fbea278ca2588fa..8cf095ea68dda55a071403734d39e9198a71d8a1 100644
--- a/src/connector/python/linux/python3/taos/__init__.py
+++ b/src/connector/python/linux/python3/taos/__init__.py
@@ -3,7 +3,7 @@ from .connection import TDengineConnection
 from .cursor import TDengineCursor
 
 # Globals
-apilevel = '2.0'
+apilevel = '2.0.3'
 threadsafety = 0
 paramstyle = 'pyformat'
 
@@ -21,4 +21,4 @@ def connect(*args, **kwargs):
 
     @rtype: TDengineConnector
     """
-    return TDengineConnection(*args, **kwargs)
\ No newline at end of file
+    return TDengineConnection(*args, **kwargs)
diff --git a/src/connector/python/linux/python3/taos/cinterface.py b/src/connector/python/linux/python3/taos/cinterface.py
index bbf5a0c7146f1fbc22befe50691df460ca8191c2..fdebe349fe9597260f231adb52022a2ecc9e1063 100644
--- a/src/connector/python/linux/python3/taos/cinterface.py
+++ b/src/connector/python/linux/python3/taos/cinterface.py
@@ -81,6 +81,7 @@ def _crow_double_to_python(data, num_of_rows, nbytes=None, micro=False):
 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)]]
     else:
@@ -106,6 +107,7 @@ def _crow_nchar_to_python(data, num_of_rows, nbytes=None, micro=False):
 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=[]
     if num_of_rows > 0:
         for i in range(abs(num_of_rows)):
diff --git a/src/connector/python/linux/python3/taos/cursor.py b/src/connector/python/linux/python3/taos/cursor.py
index d8184668c8a13daafad86a17906d2077afe62b5a..0ce20f0edaabe5cf0d2bb6efa3e031f51779f03d 100644
--- a/src/connector/python/linux/python3/taos/cursor.py
+++ b/src/connector/python/linux/python3/taos/cursor.py
@@ -27,7 +27,7 @@ class TDengineCursor(object):
     """
 
     def __init__(self, connection=None):
-        self._description = None
+        self._description = []
         self._rowcount = -1
         self._connection = None
         self._result = None
@@ -242,7 +242,7 @@ class TDengineCursor(object):
     def _reset_result(self):
         """Reset the result to unused version.
         """
-        self._description = None
+        self._description = []
         self._rowcount = -1
         if self._result is not None:
             CTaosInterface.freeResult(self._result)
diff --git a/src/connector/python/windows/python2/setup.py b/src/connector/python/windows/python2/setup.py
index 34cb7a04d701395cedc60ef13e541ad0c8303ec5..5ddbe83011daa9d408e22dbeda7172466329921e 100644
--- a/src/connector/python/windows/python2/setup.py
+++ b/src/connector/python/windows/python2/setup.py
@@ -5,7 +5,7 @@ with open("README.md", "r") as fh:
 
 setuptools.setup(
     name="taos",
-    version="2.0.2",
+    version="2.0.3",
     author="Taosdata Inc.",
     author_email="support@taosdata.com",
     description="TDengine python client package",
diff --git a/src/connector/python/windows/python2/taos/__init__.py b/src/connector/python/windows/python2/taos/__init__.py
index 4894488bc8d4e594c11a8be61fbea278ca2588fa..62e0536b6fca63a0aca0b6be3673104c27c631c6 100644
--- a/src/connector/python/windows/python2/taos/__init__.py
+++ b/src/connector/python/windows/python2/taos/__init__.py
@@ -3,7 +3,7 @@ from .connection import TDengineConnection
 from .cursor import TDengineCursor
 
 # Globals
-apilevel = '2.0'
+apilevel = '2.0.3'
 threadsafety = 0
 paramstyle = 'pyformat'
 
diff --git a/src/connector/python/windows/python2/taos/cinterface.py b/src/connector/python/windows/python2/taos/cinterface.py
index d4bf1a0350680c407dd6b957ea3f59c0c3c9612f..14f4f49be8ae719da16dbed7e79631db7ef9689e 100644
--- a/src/connector/python/windows/python2/taos/cinterface.py
+++ b/src/connector/python/windows/python2/taos/cinterface.py
@@ -81,6 +81,7 @@ def _crow_double_to_python(data, num_of_rows, nbytes=None, micro=False):
 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)]]
     else:
@@ -106,6 +107,7 @@ def _crow_nchar_to_python(data, num_of_rows, nbytes=None, micro=False):
 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=[]
     if num_of_rows > 0:
         for i in range(abs(num_of_rows)):
diff --git a/src/connector/python/windows/python2/taos/cursor.py b/src/connector/python/windows/python2/taos/cursor.py
index 71651afee1c2232ea6dc7a402e15a27ff9a6d72d..f6fde2619b0a727c74904c2338c813b97a2e602c 100644
--- a/src/connector/python/windows/python2/taos/cursor.py
+++ b/src/connector/python/windows/python2/taos/cursor.py
@@ -27,7 +27,7 @@ class TDengineCursor(object):
     """
 
     def __init__(self, connection=None):
-        self._description = None
+        self._description = []
         self._rowcount = -1
         self._connection = None
         self._result = None
@@ -193,7 +193,7 @@ class TDengineCursor(object):
     def _reset_result(self):
         """Reset the result to unused version.
         """
-        self._description = None
+        self._description = []
         self._rowcount = -1
         if self._result is not None:
             CTaosInterface.freeResult(self._result)
diff --git a/src/connector/python/windows/python3/setup.py b/src/connector/python/windows/python3/setup.py
index c09644d3301b3a488b9bfdb7b60ffbaf6dba320e..ffed304c855fda28287735d0daab27e17b0e976e 100644
--- a/src/connector/python/windows/python3/setup.py
+++ b/src/connector/python/windows/python3/setup.py
@@ -5,7 +5,7 @@ with open("README.md", "r") as fh:
 
 setuptools.setup(
     name="taos",
-    version="2.0.2",
+    version="2.0.3",
     author="Taosdata Inc.",
     author_email="support@taosdata.com",
     description="TDengine python client package",
diff --git a/src/connector/python/windows/python3/taos/__init__.py b/src/connector/python/windows/python3/taos/__init__.py
index 2fec471a1adb29f08cd0d6539e8f9682bf6bc768..c6dd929a6a5110300ecd2e1042d48a5ad6a4bf46 100644
--- a/src/connector/python/windows/python3/taos/__init__.py
+++ b/src/connector/python/windows/python3/taos/__init__.py
@@ -3,7 +3,7 @@ from .connection import TDengineConnection
 from .cursor import TDengineCursor
 
 # Globals
-apilevel = '2.0'
+apilevel = '2.0.3'
 threadsafety = 0
 paramstyle = 'pyformat'
 
diff --git a/src/connector/python/windows/python3/taos/cinterface.py b/src/connector/python/windows/python3/taos/cinterface.py
index fb1b65fc15f2f1c0f07745bb2aecf7b928a7c555..42b820ca80feda4a269e5e80f288bd1f5e87adcd 100644
--- a/src/connector/python/windows/python3/taos/cinterface.py
+++ b/src/connector/python/windows/python3/taos/cinterface.py
@@ -81,6 +81,7 @@ def _crow_double_to_python(data, num_of_rows, nbytes=None, micro=False):
 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)]]
     else:
@@ -108,6 +109,7 @@ def _crow_nchar_to_python(data, num_of_rows, nbytes=None, micro=False):
 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=[]
     if num_of_rows > 0:
         for i in range(abs(num_of_rows)):
diff --git a/src/connector/python/windows/python3/taos/cursor.py b/src/connector/python/windows/python3/taos/cursor.py
index b813bba35756065b2082d39391de3367cf9865fb..db66b99d3bfe5935a3e5b04c3692453092bcf24e 100644
--- a/src/connector/python/windows/python3/taos/cursor.py
+++ b/src/connector/python/windows/python3/taos/cursor.py
@@ -28,7 +28,7 @@ class TDengineCursor(object):
     """
 
     def __init__(self, connection=None):
-        self._description = None
+        self._description = []
         self._rowcount = -1
         self._connection = None
         self._result = None
@@ -194,7 +194,7 @@ class TDengineCursor(object):
     def _reset_result(self):
         """Reset the result to unused version.
         """
-        self._description = None
+        self._description = []
         self._rowcount = -1
         if self._result is not None:
             CTaosInterface.freeResult(self._result)