code: def _cmd_up(self):
          
          revision = self._get_revision()
          if not self._rev:
              self._log(0, "upgrading current revision")
          else:
              self._log(0, "upgrading from revision %s" % revision)
          for rev in self._revisions[int(revision) - 1:]:
              sql_files = glob.glob(os.path.join(self._migration_path, rev, "*.up.sql"))
              sql_files.sort()
              self._exec(sql_files, rev)
          self._log(0, "done: upgraded revision to %s\n" % rev)
docs: Upgrade to a revision