Type error create_engine() take at least 3 arguments (3 given)
很显然这是参数错误defcreate_engine(user,password,database,host='127.0.0.1',port=3306,**kw):importMySQLdbglobalengineifengineisnotNone:raiseDBError('Engineisalreadyinitialized.')#devdb在以如下方式引用这个函数时报这个错误db.creat