code: def get_changesets(self, start=None, end=None, start_date=None,
                         end_date=None, branch_name=None, reverse=False):
          
          raise NotImplementedError
docs: Returns iterator of ``MercurialChangeset`` objects from start to end
          not inclusive This should behave just like a list, ie. end is not
          inclusive
  
          :param start: None or str
          :param end: None or str
          :param start_date:
          :param end_date:
          :param branch_name:
          :param reversed: