code: def iter_issue_events(self, number=-1, etag=None):
          
          url = self._build_url('issues', 'events', base_url=self._api)
          return self._iter(int(number), url, IssueEvent, etag=etag)
docs: Iterates over issue events on this repository.
  
          :param int number: (optional), number of events to return. Default: -1
              returns all available events
          :param str etag: (optional), ETag from a previous request to the same
              endpoint
          :returns: generator of
              :class:`IssueEvent <github3.issues.event.IssueEvent>`\ s