def get_stats_punch_card(self):
        """
        :calls: `GET /repos/:owner/:repo/stats/punch_card <http://developer.github.com/v3/repos/statistics/#get-the-number-of-commits-per-hour-in-each-day>`_
        :rtype: None or :class:`github.StatsPunchCard.StatsPunchCard`
        """
        headers, data = self._requester.requestJsonAndCheck(
            "GET",
            self.url + "/stats/punch_card"
        )
        if not data:
            return None
        else:
            return github.StatsPunchCard.StatsPunchCard(self._requester, headers, data, completed=True)
:calls: `GET /repos/:owner/:repo/stats/punch_card <http://developer.github.com/v3/repos/statistics/#get-the-number-of-commits-per-hour-in-each-day>`_
        :rtype: None or :class:`github.StatsPunchCard.StatsPunchCard`