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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def as_dash_app(self):
        '''
        Return a DjangoDash instance of the dash application
        '''
        dateless_dash_app = getattr(self, '_stateless_dash_app_instance', None)
        if not dateless_dash_app:
            dateless_dash_app = get_stateless_by_name(self.app_name)
            setattr(self, '_stateless_dash_app_instance', dateless_dash_app)
        return dateless_dash_app