code: def set_radio(self, data):
          
          for (name, value) in data.items():
              # Case-insensitive search for type=radio
              radios = self.find_by_type("input", "radio", {'name': name})
              if not radios:
                  raise InvalidFormMethod("No input radio named " + name)
  
              # only one radio button can be checked
              self.uncheck_all(name)
  
              # Check the appropriate radio button (value cannot be a list/tuple)
              for radio in radios:
                  if radio.attrs.get("value", "on") == str(value):
                      radio["checked"] = ""
                      break
              else:
                  raise LinkNotFoundError(
                      "No input radio named %s with choice %s" % (name, value)
                  )
docs: Set the *checked*-attribute of input elements of type "radio"
          specified by ``data`` (i.e. select radio buttons).
  
          :param data: Dict of ``{name: value, ...}``.
              In the family of radio buttons whose *name*-attribute is ``name``,
              check the radio button whose *value*-attribute is ``value``.
              Only one radio button in the family can be checked.