docs: def options(self, valuegetter=text_type):
          """Return a generator over the (value, label) pairs, where value
          is a string associated with each choice. This convenience method
          is useful to populate, for instance, a form select field.
  
          :param valuegetter: Can be a callable or a string. In the former case, it must
              be a one-argument callable which returns the value of a
              choice. In the latter case, the string specifies the name
              of an attribute of the choice objects. Defaults to `str()`
              or `unicode()`.
          """
          valuegetter = valuegetter if callable(valuegetter) else attrgetter(valuegetter)
          pairs = zip_longest(self.choices, self.labels, fillvalue='')
  
          return ((valuegetter(choice), label) for choice, label in pairs)