Python IP地址和端口的分割方法

需求：要把输入的URL进行处理，并且取出IP地址和端口
注意：此代码来源Tornado源码

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import re
import urllib.parse
from typing import Tuple, Optional

# . 一次或多次,()结果整体为一个分组
_netloc_re = re.compile(r"^(.+):(\d+)$")


def split_host_and_port(input_url: str) -> Tuple[str, Optional[int]]:
    """
        取出IP地址和端口 返回：`(host, port)` 元组
    """
    parsed_ret = urllib.parse.urlsplit(input_url)
    if parsed_ret.scheme not in ("http", "https"):
        raise ValueError("Unsupported url scheme: %s" % input_url)
    netloc = parsed_ret.netloc
    match = _netloc_re.match(netloc)
    if match:
        host = match.group(1)
        port = int(match.group(2))  # type: Optional[int]
    else:
        host = netloc
        if parsed_ret.scheme == 'http':
            port = 80
        elif parsed_ret.scheme == 'https':
            port = 443
        else:
            port = None
    return (host, port)

if __name__ == '__main__':
    ret = split_host_and_port('https://www.cnblogs.com/liown/p/9927879.html')
    print(ret)  # ('www.cnblogs.com', 443)