YouTube URL to UCID Resolver

resolve.py

from requests import session
from sys import argv

mys = session()

def resolve_url(url: str, iter=False):
    result = mys.post("https://www.youtube.com/youtubei/v1/navigation/resolve_url?key=AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8", json={"context": {"client": {"clientName": "WEB", "clientVersion": "2.20211012.01.00"}}, "url": url}).json()
    if "endpoint" in result.keys():
        rend = result["endpoint"]
        rkey = rend.keys()
        if "browseEndpoint" in rkey:
            ri = rend["browseEndpoint"]["browseId"]
            if len(ri) == 24 and ri.startswith("UC"):
                return ri
        elif "urlEndpoint" in rkey and not iter:
            return resolve_url(rend["urlEndpoint"]["url"], True)
    return None

if len(argv) == 2:
    print(resolve_url(argv[1]))
else:
    print("""YouTube URL to UCID Resolver by tech234a
    USAGE: python3 resolve.py [Channel URL]
    Or use as a Python module by importing this file
    and using the resolve_url function.
    REQUIREMENTS: requests (pip install requests)
    NOTES: Only provide 1 channel URL at a time.""")