docs: def set_ocha_url(cls, url=None):
          # type: (str) -> None
          """
          Set World Bank url from which to retrieve countries data
  
          Args:
              url (str): World Bank url from which to retrieve countries data. Defaults to internal value.
  
          Returns:
              None
          """
          if url is None:
              url = cls._ochaurl_int
          cls._ochaurl = url