AttributeError: 'NoneType' object has no attribute 'execute' 错误的解决

运行Python连接mysql数据，查询表格中的数据时报了如下错误AttributeError: 'NoneType' object has no attribute 'execute' 的解决方案

python get_uv_pv_compute_results_from_database.py 

Traceback (most recent call last):

  File "get_uv_pv_compute_results_from_database.py", line 116, in <module>

    obi_get_pv_uv_result_from_database.get_day_pv_uv_from_mysql()

  File "get_uv_pv_compute_results_from_database.py", line 73, in get_day_pv_uv_from_mysql

    res_num = self.execute_pv_uv(sql_get_day_pv_uv_results)

  File "get_uv_pv_compute_results_from_database.py", line 40, in execute_pv_uv

    return self.conn_pv_uv.execute(sql)

  File "/home/yaoyingzhe/2222/db.py", line 33, in execute

    return self.cursor.execute(sql)

AttributeError: 'NoneType' object has no attribute 'execute'

解决方案：

1.mysql数据库没有正确连接，你确认所以参数都对吗？没有漏掉哪个？比如端口。
def Connect(self, *args, **kwargs):
self.conn = MySQLdb.connect(*args, **kwargs)
self._cursor = self.conn.cursor()

2. 在使用mysql的mysql语句进行查询等操作之前，应该先连接mysql数据库，然后进行查询等操作，最后在完成操作之后，一定要关闭连接

def connect(self):
self.connection = MySQLdb.connect(host=self.my_host, user=self.my_user, passwd=self.my_passwd,
db=self.my_db, port=int(self.my_port), charset=self.my_charset)
self.cursor = self.connection.cursor()

def close(self):
self.cursor.close()
self.connection.close()

def execute(self, sql):
return self.cursor.execute(sql)

def fetchall(self):
return self.cursor.fetchall()

def commit(self):
#self.cursor.close()
self.connection.commit()