'Iterate over the files associated with this pull request.
:param int number: (optional), number of files to return. Default:
-1 returns all available files.
:param str etag: (optional), ETag from a previous request to the same
endpoint
:returns: generator of :class:`PullFile <PullFile>`\ s'

def files(self, number=(-1), etag=None):

    url = self._build_url(u'files', base_url=self._api)
    return self._iter(int(number), url, PullFile, etag=etag)
