'Iterate over deploy keys on this repository.
:param int number: (optional), number of keys to return. Default: -1
returns all available keys
:param str etag: (optional), ETag from a previous request to the same
endpoint
:returns: generator of :class:`~github3.users.Key`\ s'

@requires_auth
def keys(self, number=(-1), etag=None):

    url = self._build_url(u'keys', base_url=self._api)
    return self._iter(int(number), url, users.Key, etag=etag)
