def get_changesets(self, start=None, end=None, start_date=None,

                       end_date=None, branch_name=None, reverse=False, max_revisions=None):

        """

        Returns iterator of ``BaseChangeset`` objects from start to end,

        both inclusive.

        :param start: None or str

        :param end: None or str

        :param start_date:

        :param end_date:

        :param branch_name:

        """

        raise NotImplementedError

    def get_diff_changesets(self, org_rev, other_repo, other_rev):

        """

        Returns lists of changesets that can be merged from this repo @org_rev

        to other_repo @other_rev

        ... and the other way

        ... and the ancestors that would be used for merge

        :param org_rev: the revision we want our compare to be made

        :param other_repo: repo object, most likely the fork of org_repo. It has

    def get_changesets(self, start=None, end=None, start_date=None,

                       end_date=None, branch_name=None, reverse=False, max_revisions=None):

        """

        Returns iterator of ``MercurialChangeset`` objects from start to end

        (both are inclusive)

        :param start: None, str, int or mercurial lookup format

        :param end:  None, str, int or mercurial lookup format

        :param start_date:

        :param end_date:

        :param branch_name:

        """

        start_raw_id = self._get_revision(start)

        start_pos = None if start is None else self.revisions.index(start_raw_id)

        end_raw_id = self._get_revision(end)

        end_pos = None if end is None else self.revisions.index(end_raw_id)

        if start_pos is not None and end_pos is not None and start_pos > end_pos:

            raise RepositoryError("Start revision '%s' cannot be "

                                  "after end revision '%s'" % (start, end))

        if branch_name and branch_name not in self.allbranches:

            msg = "Branch %r not found in %s" % (branch_name, self.name)