docs: def remove_from_labels(self, label):
          """
          :calls: `DELETE /repos/:owner/:repo/issues/:number/labels/:name <http://developer.github.com/v3/issues/labels>`_
          :param label: :class:`github.Label.Label` or string
          :rtype: None
          """
          assert isinstance(label, (github.Label.Label, str, unicode)), label
          if isinstance(label, github.Label.Label):
              label = label._identity
          else:
              label = urllib.quote(label)
          headers, data = self._requester.requestJsonAndCheck(
              "DELETE",
              self.issue_url + "/labels/" + label
          )