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python3中构造http的Request需要用到urllib.request. 有时会用到cookie。 比如在访问网站首页得到cookie,通过下面代码添加cookie:    #install cookie **    cj = cookiejar.CookieJar();     opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj));     urllib.request.install_opener(opener)**     #build request for accessed url     homeReq = urllib.request.Request(          url = csdnAccessModuleUrl          )     homeReq.add_header('Accept', 'text/html, application/xhtml+xml, */*');     homeReq.add_header('Accept-Language', 'en-US')     homeReq.add_header('Accept-Encoding', 'gzip, deflate')     homeReq.add_header('Connection', 'Keep-Alive');     homeReq.add_header('Referer', 'http://passport.csdn.net/account/login?from='+urllib.parse.quote(moduleUrl))#http%3a%2f%2fwrite.blog.csdn.net%2f')     homeReq.add_header('User-Agent', 'Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)');     #open access url     resp = urllib.request.urlopen(homeReq) 在上述代码运行后, 我们可以获取到cookie, 然后在后续登陆中用到此cookie。