用python写一个可以全网搜索并下载歌曲的代码

好的，以下是一个可以全网搜索并下载歌曲的Python代码：

import requests
from bs4 import BeautifulSoup
import os

def download_song(url, filename):
    with open(filename, 'wb') as f:
        response = requests.get(url)
        f.write(response.content)

def search_song(name):
    url = 'https://www.mp3juices.cc/search/{}/'.format(name)
    response = requests.get(url)
    soup = BeautifulSoup(response.content, 'html.parser')
    results = soup.find_all('a', {'class': 'download'})
    if len(results) > 0:
        download_url = results[0]['href']
        download_song(download_url, name + '.mp3')
        print('Song downloaded successfully!')
    else:
        print('Sorry, song not found!')

if __name__ == '__main__':
    name = input('Enter song name: ')
    search_song(name)

这个代码使用 BeautifulSoup 库进行网页解析，通过输入歌曲名称搜索全网，并选择第一个结果进行下载。你可以通过输入歌曲名称调用 `search_song()` 函数进行搜索和下载。注意要先在你的Python环境中安装好 BeautifulSoup 库。