code: def contains(self, key):
      '''Returns whether the object named by `key` exists.
         LoggingDatastore logs the access.
      '''
      self.logger.info('%s: contains %s' % (self, key))
      return super(LoggingDatastore, self).contains(keyf contains(self, key):
      '''Returns whether the object named by `key` exists.
         LoggingDatastore logs the access.
      '''
      self.logger.info('%s: contains %s' % (self, key))
      return super(LoggingDatastore, self).contains(key)
docs: Returns whether the object named by `key` exists.
         LoggingDatastore logs the access.