一个简单的爬虫 头部构造

# -*- coding:utf-8 -*-import urllib.requestimport randomua_headers = {    'Ur-Agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefo元旦活动策划x/57.0',}head_list=[        "Mozilla/5.0 (Macintosh; Intel Mac OS珍贵的反义词 X 10.6; rv2.0.1) Gecko/20100101 Firefox/4.0.1",        "Mozilla/5.0 (Windows NT 6.1; rv2.0.1) Gecko/20100101 Firefox/4.0.1",        "Opera/9.80 (Macintosh; Intel Mac OS X 10.6.8; U; en) Presto/2.8.131 Version/11.11",        "Opera/9.80 (Windows 自考本科需要什么条件与要求NT 6.1; U; en) Presto/2.8.131湿疹药膏 Version/11.11",        "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_0) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.56 Safari/535.11"]ur_agent=random.choice(head_list)url = r'/d/file/titlepic/forbidden.html