Python Flask安全示例不起作用

我编辑了app.py文件，通过MongoEngine只使用MongoDB（您可以选择MongoDB或SQL）。这是我尝试运行应用程序时的输出：

    Familys-imac:flask-security Paul-Arthur$ python app.py
    Traceback (most recent call last):
      File "app.py", line 17, in <module>
        from flask.ext.security.datastore import MongoEngineUserDatastore
      File "/Library/Python/2.7/site-packages/flask/exthook.py", line 86, in load_module
        raise ImportError('No module named %s' % fullname)
    ImportError: No module named flask.ext.security.datastore.MongoEngineUserDatastore

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对于SQLAlchemy，您可以将其导入为：

从flask.ext.security.datastore.sqlalchemy导入SQLAlchemyUserDatastore

我认为Mongo会：

从flask.ext.security.datastore.mongoengine导入mongoengineuredatastore

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您可以在Flask API页面上的示例中看到它：from Flask.ext.mongoengine import mongoengine from Flask.ext.security.datastore.mongoengine import mongoengineueserdatastore

    familys-imac:flask-security Paul-Arthur$ pip install MongoEngine
    Requirement already satisfied (use --upgrade to upgrade): MongoEngine in /Library/Python/2.7/site-packages
    Requirement already satisfied (use --upgrade to upgrade): pymongo in /Library/Python/2.7/site-packages (from MongoEngine)
    Cleaning up...