那么列表理解呢？如果结果为((123,), (234,), (345,))：
>>> row = [item[0] for item in cursor.fetchall()]
>>> row
[123, 234, 345]
如果结果为({'id': 123}, {'id': 234}, {'id': 345})：
>>> row = [item['id'] for item in cursor.fetchall()]
>>> row
[123, 234, 345]
Python MySQLDB：在列表中获取fetchall的结果
Python MySQLDB：在列表中获取fetchall的结果
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