code: def month(self, month):
          
          if month is None:
              raise ValueError("Invalid value for `month`, must not be `None`")
          if month is not None and not re.search('^\\d{4}-\\d{2}$', month):
              raise ValueError("Invalid value for `month`, must be a follow pattern or equal to `/^\\d{4}-\\d{2}$/`")
  
          self._month = month
docs: Sets the month of this ReportResponse.
          Month of requested billing report
  
          :param month: The month of this ReportResponse.
          :type: str