docs: def python_2_format_compatible(method):
      """
      Handles bytestring and unicode inputs for the `__format__()` method in
      Python 2. This function has no effect in Python 3.
  
      :param method: The `__format__()` method to wrap.
      :return: The wrapped method.
      """
      if six.PY3:
          return method
  
      def wrapper(self, format_spec):
          formatted = method(self, format_spec)
          if isinstance(format_spec, str):
              # bytestring
              return formatted.encode('utf-8')
  
          # unicode
          return formatted
      return wrapper