python抓取百度首页

import urllib
def downurl(url,filename):
    try:
        fp=urllib.urlopen(url)
    except:
        print('download error')
        return 0
    op=open(filename,'wb')
    while 1:
         s=fp.read()
         if not s:
             break
         op.write(s)
    fp.close()
    op.close()
    return 1
downurl("https://www.baidu.com","d:\\code\\url.txt")