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SQLAlchemy：execute() 得到了意外的关键字参数

我有database.py其中包含数据库执行函数

import sqlachemy

class DB():
def __init__(self, **kwargs):
    self.connection = None
    self.connect(**kwargs)

def connect(self, **kwargs):
    if 'url' in kwargs and kwargs.get('url') is not None:
        return self.connectUrl(kwargs.get('url'), kwargs.get('username'), 
            kwargs.get('password'), kwargs.get('database'))
    else : 
        return self.connectHost(kwargs.get('host'), kwargs.get('port'), kwargs.get('username'), 
            kwargs.get('password'), kwargs.get('database'))

def execute(self, query):
    if self.connect is None:
        raise Exception('No connection')

    try:
        with self.connection.connect() as conn:
            return conn.execute(query)
    except (pymysql.err.OperationalError, sqlalchemy.exc.OperationalError) as e:
        print(e)
    except (Exception) as e:
        print(e)
    else:
        return None

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我还有一个 main.py. 我从上面的文件导入 DB 类并在此处使用它。