QQ Music Downloader

qqmusic_dl.py

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

import os
import requests
import sys
import time

from lxml import etree


def main(args):

    PREFIX = "music"

    tree = etree.parse(sys.stdin, etree.HTMLParser())

    for i, music in enumerate(tree.xpath("//qqmusic"), 1):
        name = music.get("music_name")
        singer, sep, album = music.get("singer").partition(" - ")
        uri = music.get("audiourl")
        print(i, name, singer, uri)
        response = requests.get(uri)
        filename = "{0}({1}).m4a".format(name, singer)
        with open(os.path.join(PREFIX, filename), "wb") as f:
            f.write(response.content)
            f.flush()
        time.sleep(0.5)

    return os.EX_OK


if __name__ == '__main__':
    sys.exit(main(sys.argv[:]))

how to install and how to use this can you write me?