def next(self, branch=None):

        if branch and self.branch != branch:
            raise VCSError('Branch option used on changeset not belonging '
                           'to that branch')

        def _next(changeset, branch):
            try:
                next_ = changeset.revision + 1
                next_rev = changeset.repository.revisions[next_]
            except __HOLE__:
                raise ChangesetDoesNotExistError
            cs = changeset.repository.get_changeset(next_rev)

            if branch and branch != cs.branch:
                return _next(cs, branch)

            return cs

        return _next(self, branch)
dataset/ETHPy150Open codeinn/vcs/vcs/backends/git/changeset.py/GitChangeset.next