'Neither SQLALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set.

UserWarning: Neither SQLALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set. Defaulting SQLALCHEMY_DATABASE_URI to "sqlite:///:memory:".
'Neither SQLALCHEMY_DATABASE_URI nor SQLALCHEMY_BINDS is set.

注意

出现以上问题，看看是不是打错了