get aws ip ranges in cn-north-1 region

aws_ip_ranges.py

#!/usr/bin/env python -O
# -*- coding: utf-8 -*-
#from __future__ import print_function, unicode_literals, with_statement, division, absolute_import

# import os
# import random
# import requests
import sys
import requests

from netaddr import IPSet

# https://docs.aws.amazon.com/general/latest/gr/aws-ip-ranges.html


def main():
    # ipv4
    # ipv6_prefixes for ipv6 ranges
    ip_ranges = requests.get(
        'https://ip-ranges.amazonaws.com/ip-ranges.json').json()['prefixes']

    with open('aws_cn-north-1_ip_ranges.txt', 'w') as fout:
        s = IPSet(
            map(lambda x: x['ip_prefix'],
                filter(lambda x: x['region'] == 'cn-north-1', ip_ranges)))
        for i in s.iter_cidrs():
            print(i, file=fout)

    return 0


if __name__ == '__main__':
    sys.exit(main())