Decode BitTorrent udp tracker announce

announce.py

import sys
import struct


data = open(sys.argv[1], 'rb').read()

start = 0
client_id, action, transaction_id, infohash, peer_id, downloaded, left, uploaded, event, ip, key, num_want, port, extensions, s_len = (
    struct.unpack('!QII20s20sQQQIIIiHHB', data)
)
print(f'{client_id=:x}, {action=}, {transaction_id=}, infohash={infohash.hex()}, peer_id={peer_id.decode("ascii")}')
print(f'{downloaded=}, {uploaded=}, {left=}, {event=}, {ip=}, {num_want=}, {port=}, extensions={bin(extensions)}')
print(f'{s_len=}')