main.py 文件源码

def get_greetings(self, guestbook_name):
        """
        get_greetings()
        Checks the cache to see if there are cached greetings.
        If not, call render_greetings and set the cache

        Args:
          guestbook_name: Guestbook entity group key (string).

        Returns:
          A string of HTML containing greetings.
        """
        greetings = memcache.get('{}:greetings'.format(guestbook_name))
        if greetings is None:
            greetings = self.render_greetings(guestbook_name)
            if not memcache.add('{}:greetings'.format(guestbook_name),
                                greetings, 10):
                logging.error('Memcache set failed.')
        return greetings
    # [END check_memcache]

    # [START query_datastore]