docs: def generate(self):
          """
          Generate Lambda function source; return it as a string.
  
          :rtype: str
          :returns: lambda function source
          """
          s = self._docstring
          s += self._get_source().replace(
              'endpoints = {}',
              'endpoints = ' + self._config_src
          ).replace(
              'logger.setLevel(logging.INFO)',
              'logger.setLevel(logging.%s)' % self.config.logging_level
          )
          return s