How to use the jrnl.Utils.format_xid function in jrnl

def report(self, show_stats, show_records):
        """Return a string containing a text report for all records in the map"""
        if len(self.__map) == 0:
            return "No outstanding transactions found."
        rstr = "%d outstanding transactions found" % len(self.__map)
        if show_records:
            rstr += ":"
            for xid, tup in self.__map.iteritems():
                rstr += "\n  xid=%s:" % jrnl.Utils.format_xid(xid)
                for i in tup:
                    rstr += "\n   %s" % str(i[1])
        else:
            rstr += "."
        return rstr

# Test hook
        if self._csv_txn_cb != None and self._csv_txn_cb(self._csv_store_chk, hdr):
            return True
               
        if hdr.magic[-1] == "a":
            self._abort_cnt += 1
        else:
            self._commit_cnt += 1
        
        if self._tmap.contains(hdr.xid):
            mismatched_rids = self._tmap.delete(hdr)
            if mismatched_rids != None and len(mismatched_rids) > 0:
                self._warning.append("WARNING: transactional dequeues not found in enqueue map; rids=%s" %
                                     mismatched_rids)
        else:
            self._warning.append("WARNING: %s not found in transaction map" % jrnl.Utils.format_xid(hdr.xid))
        if hdr.magic[-1] == "c": # commits only
            self._txn_obj_list[hdr.xid] = hdr
        return False