'Iterate over public keys for the authenticated user.
:param int number: (optional), number of keys to return. Default: -1
returns all your keys
:param str etag: (optional), ETag from a previous request to the same
endpoint
:returns: generator of :class:`Key <github3.users.Key>`\ s'

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

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