code: def copy(self, sleep=_unset, stop=_unset, wait=_unset,
               retry=_unset, before=_unset, after=_unset, before_sleep=_unset,
               reraise=_unset):
          
          if before_sleep is _unset:
              before_sleep = self.before_sleep
          return self.__class__(
              sleep=self.sleep if sleep is _unset else sleep,
              stop=self.stop if stop is _unset else stop,
              wait=self.wait if wait is _unset else wait,
              retry=self.retry if retry is _unset else retry,
              before=self.before if before is _unset else before,
              after=self.after if after is _unset else after,
              before_sleep=before_sleep,
              reraise=self.reraise if after is _unset else reraise,
          )
docs: Copy this object with some parameters changed if needed.