amazon ip ranges in varnish

I just recently realized that amazon exposes all of their ip ranges in a easy to get json format here (https://ip-ranges.amazonaws.com/ip-ranges.json)
you can also read the docs here (http://docs.aws.amazon.com/general/latest/gr/aws-ip-ranges.html)

So I made this python script to fetch the latest ip ranges from amazon and place them in a varnish vcl file in order for me to use it as an ACL in varnish.

#!/usr/bin/env python
from __future__ import print_function
import json
import requests
import re

amazon_url = "https://ip-ranges.amazonaws.com/ip-ranges.json"
r = requests.get(amazon_url)
json_response = r.json()

f = open('aws.vcl','w')
print("# Created date: " + json_response['createDate'], file=f)
print("acl aws {", file=f)

prefixes = json_response['prefixes']
for prefix in prefixes:
    varniship = re.sub(r'^','  "', prefix['ip_prefix'])
    varniship = re.sub(r'(\/\d+)$', '"\\1;', varniship )
    varniship += "\t\t# Service: " + prefix['service'] + "  Region: " + prefix['region']
    print(varniship, file=f)

print("}", file=f)
f.close