def get_used_range(self):
url = self.build_url(self._endpoints.get('<STR_LIT>'))<EOL>response = self.session.get(url)<EOL>if not response:<EOL><INDENT>return None<EOL><DEDENT>return self.range_constructor(parent=self, **{self._cloud_data_key: response.json()})<EOL>
Returns the smallest range that encompasses any cells that
         have a value or formatting assigned to them.