<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _new_url(self, relative_url):
 """Create new Url which points to new url."""


        return Url(
            urljoin(self._base_url, relative_url),
            **self._default_kwargs
        )