:calls: `GET /repos/:owner/:repo/git/tags/:sha <http://developer.github.com/v3/git/tags>`_
        :param sha: string
        :rtype: :class:`github.GitTag.GitTag`

def get_git_tag(self, sha):
        """
        :calls: `GET /repos/:owner/:repo/git/tags/:sha <http://developer.github.com/v3/git/tags>`_
        :param sha: string
        :rtype: :class:`github.GitTag.GitTag`
        """
        assert isinstance(sha, (str, unicode)), sha
        headers, data = self._requester.requestJsonAndCheck(
            "GET",
            self.url + "/git/tags/" + sha
        )
        return github.GitTag.GitTag(self._requester, headers, data, completed=True)