InvalidRequestError: Table is already defined for this MetaData instance. Specify 'extend_existing=True' to redefine options and columns on an existing Table object.

解决方法

添加在导入包后的位置

#models.py
#from .....
if __name__ == ‘__main__‘:
    db.metadata.clear()

参考链接:https://stackoverflow.com/questions/37908767/table-roles-users-is-already-defined-for-this-metadata-instance

文章来自：https://www.cnblogs.com/edhg/p/8907300.html