轮换与静态数据中心代理：你需要哪一种？

"""Spread jobs over your own static IPs: round-robin, or one fixed IP per site."""
import hashlib
import itertools
from urllib.parse import quote, urlsplit

import requests  # pip install requests

# One line per IP, copied from your account: IP:PORT:USERNAME:PASSWORD
LINES = [
    '203.0.113.24:8000:USERNAME:PASSWORD',
    '203.0.113.97:8000:USERNAME:PASSWORD',
    '198.51.100.7:8000:USERNAME:PASSWORD',
]


def to_proxy_url(line):
    ip, port, user, password = line.strip().split(':', 3)
    return f'http://{quote(user, safe="")}:{quote(password, safe="")}@{ip}:{port}'


PROXIES = [to_proxy_url(line) for line in LINES]
next_proxy = itertools.cycle(PROXIES)


def fetch_round_robin(url):
    proxy = next(next_proxy)  # 1st, 2nd, 3rd, then back to the 1st
    return requests.get(url, proxies={'http': proxy, 'https': proxy}, timeout=20)


def fetch_sticky(url):
    # The same website always leaves from the same IP: steady sessions and allowlists.
    host = urlsplit(url).hostname or ''
    index = int(hashlib.sha256(host.encode()).hexdigest(), 16) % len(PROXIES)
    proxy = PROXIES[index]
    return requests.get(url, proxies={'http': proxy, 'https': proxy}, timeout=20)


if __name__ == '__main__':
    for _ in range(3):
        print(fetch_round_robin('https://api.ipify.org').text)
    print(fetch_sticky('https://httpbin.org/ip').json())