How to use the ipdb.District function in ipdb

def test_district():
    db = ipdb.District("c:/work/ipdb/china_district.ipdb")
    print(db.is_ipv4(), db.is_ipv6())
    print(db.languages())
    print(db.fields())
    print(db.build_time())
    for A in range(223):
        for B in range (255):
            try:
                print(db.find("%d.%d.114.144" % (A, B), "CN"))
            except ipdb.IPNotFound as e:
                print(e)

    try:
        print(db.find("1.1.1.1", "CN"))
    except ipdb.IPNotFound as e: # ip not found
        print(e)
    except ipdb.DatabaseError as e: # database file size error