docs: def is_url(path):
          """Test if path represents a valid URL.
  
          :param str path: Path to file.
          :return: True if path is valid url string, False otherwise.
          :rtype: :py:obj:`True` or :py:obj:`False`
          """
          try:
              parse_result = urlparse(path)
              return all((parse_result.scheme, parse_result.netloc, parse_result.path))
          except ValueError:
              return False