code: def form_field(self):
          "Returns appropriate form field."
          label = unicode(self)
          defaults = dict(required=False, label=label, widget=self.widget)
          defaults.update(self.extra)
          return self.field_class(**defaultsf form_field(self):
          "Returns appropriate form field."
          label = unicode(self)
          defaults = dict(required=False, label=label, widget=self.widget)
          defaults.update(self.extra)
          return self.field_class(**defaults)
docs: Returns appropriate form field.