code: def address(self):
          
          hlink = self._hlink
  
          # there's no URL if there's no click action
          if hlink is None:
              return None
  
          # a click action without a relationship has no URL
          rId = hlink.rId
          if not rId:
              return None
  
          return self.part.target_ref(rId)
docs: Read/write. The URL of the hyperlink. URL can be on http, https,
          mailto, or file scheme; others may work. Returns |None| if no
          hyperlink is defined, including when another action such as
          `RUN_MACRO` is defined on the object. Assigning |None| removes any
          action defined on the object, whether it is a hyperlink action or
          not.