import requests
import re

url = r'https://antizapret.prostovpn.org/proxy.pac'
response = requests.get(url)
reg = re.compile(r'proxy\.antizapret.*\d')
prox = re.findall(reg, response.text)[0]
proxies = {
    'http': 'http://{0}'.format(prox),
    'https': 'https://{0}'.format(prox),
}