add python examples

docs-cn/06-insert-data/_py_sql.mdx

+```py
+{{#include docs-examples/python/native_insert_example.py}}
+```

docs-cn/06-insert-data/_py_stmt.mdx

+```py
+{{#include docs-examples/python/bind_param_example.py}}
+```
\ No newline at end of file

docs-cn/07-query-data/_py.mdx

+```py
+{{#include docs-examples/python/query_example.py}}
+```

docs-cn/07-query-data/_py_async.mdx

+```py
+{{#include docs-examples/python/async_query_example.py}}
+```

docs-examples/python/async_query_example.py

+import taos
\ No newline at end of file

docs-examples/python/bind_param_example.py

+import taos
\ No newline at end of file

docs-examples/python/json_protocol_example.py

@@ -9,16 +9,18 @@ lines = [[{"metric": "meters.current", "timestamp": 1648432611249, "value": 10.3
           {"metric": "meters.voltage", "timestamp": 1648432611250, "value": 221, "tags": {"location": "Beijing.Haidian", "groupid": 1}}]
          ]
 
-# create connection use firstEP in taos.cfg.
-conn = taos.connect()
 
+def get_connection():
+    # create connection use firstEp in taos.cfg.
+    return taos.connect()
 
-def create_database():
+
+def create_database(conn):
     conn.execute("create database test")
     conn.execute("use test")
 
 
-def insert_lines():
+def insert_lines(conn):
     global lines
     lines = [json.dumps(line) for line in lines]
     print(lines)
@@ -27,5 +29,7 @@ def insert_lines():
 
 
 if __name__ == '__main__':
-    create_database()
-    insert_lines()
+    connection = get_connection()
+    create_database(connection)
+    insert_lines(connection)
+    connection.close()

docs-examples/python/line_protocol_example.py

@@ -11,21 +11,25 @@ lines = ["meters,location=Beijing.Chaoyang,groupid=2 current=10.3,voltage=219,ph
          "meters,location=Beijing.Haidian,groupid=3 current=11.3,voltage=221,phase=0.35 1648432611249800",
          ]
 
-# create connection use firstEP in taos.cfg.
-conn = taos.connect()
 
+def get_connection():
+    # create connection use firstEP in taos.cfg.
+    return taos.connect()
 
-def create_database():
+
+def create_database(conn):
     # the default precision is ms (microsecond), but we use us(microsecond) here.
     conn.execute("create database test precision 'us'")
     conn.execute("use test")
 
 
-def insert_lines():
+def insert_lines(conn):
     affected_rows = conn.schemaless_insert(lines, SmlProtocol.LINE_PROTOCOL, SmlPrecision.MICRO_SECONDS)
     print(affected_rows)  # 8
 
 
 if __name__ == '__main__':
-    create_database()
-    insert_lines()
+    connection = get_connection()
+    create_database(connection)
+    insert_lines(connection)
+    connection.close()

docs-examples/python/native_insert_example.py

+import taos
\ No newline at end of file

docs-examples/python/query_example.py

+import taos
+
+conn = taos.connect()
+
+
+def print_all():
+    result = conn.query()

docs-examples/python/telnet_line_protocol_example.py

@@ -12,20 +12,24 @@ lines = ["meters.current 1648432611249 10.3 location=Beijing.Chaoyang groupid=2"
          "meters.voltage 1648432611250 217 location=Beijing.Haidian groupid=3",
          ]
 
-# create connection use firstEP in taos.cfg.
-conn = taos.connect()
 
+# create connection use firstEp in taos.cfg.
+def get_connection():
+    return taos.connect()
 
-def create_database():
+
+def create_database(conn):
     conn.execute("create database test")
     conn.execute("use test")
 
 
-def insert_lines():
+def insert_lines(conn):
     affected_rows = conn.schemaless_insert(lines, SmlProtocol.TELNET_PROTOCOL, SmlPrecision.NOT_CONFIGURED)
     print(affected_rows)  # 8
 
 
 if __name__ == '__main__':
-    create_database()
-    insert_lines()
+    connection = get_connection()
+    create_database(connection)
+    insert_lines(connection)
+    connection.close()