Flask组件之Flask-session

1、Flask模块中session与Flask-session组件中session的继承关系：

　　Flask模块sessions.py：

class SessionInterface(object):
    def open_session(self, app, request):
        raise NotImplementedError()

    def save_session(self, app, session, response):
        raise NotImplementedError()

class SecureCookieSessionInterface(SessionInterface):
    def open_session(self, app, request):
        pass

    def save_session(self, app, session, response):
        pass

　　flask-session组件sessions.py:

class SessionInterface(FlaskSessionInterface):
    pass

class NullSessionInterface(SessionInterface):
    pass
    
class RedisSessionInterface(SessionInterface):
    pass
    
class MemcachedSessionInterface(SessionInterface):
    pass
    
class FileSystemSessionInterface(SessionInterface):
    pass
    
class MongoDBSessionInterface(SessionInterface):
    pass
    
class SqlAlchemySessionInterface(SessionInterface):
    pass