':calls: `POST /gists/:gist_id/comments <http://developer.github.com/v3/gists/comments>`_
:param body: string
:rtype: :class:`github.GistComment.GistComment`'

def create_comment(self, body):

    assert isinstance(body, (str, unicode)), body
    post_parameters = {'body': body}
    (headers, data) = self._requester.requestJsonAndCheck('POST', (self.url + '/comments'), input=post_parameters)
    return github.GistComment.GistComment(self._requester, headers, data, completed=True)
