help！
import urllib.request
def copy_artical(url):
req = urllib.request.Request(url)
req.add_header('User-Agent','Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko')
html = urllib.request.urlopen(req).read().decode('GB2312')
return html
url = str(input('请输入你要爬取网站的网址：'))
a = copy_artical(url)
with open('copy_in','w') as f:
f.write(a)
为啥我写的这个出来的总是一个不能打开不能压缩的文件？ 没写后缀 至少改成 'copy_in.txt'
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