Python实践之网络编程1-简单的网络请求程序

import sys,urllib,urllib2


#构造参数
#zipcode = sys.argv[1]
wd = input("search word:")
data = urllib.urlencode([(‘wd‘,wd)])

#构造url 不需要将参数拼接到url中
url= "http://www.baidu.com"
print ‘ursing url‘, url

#构造request 只需要将参数放到urlopen的第二个参数里
req = urllib2.Request(url)
fd = urllib2.urlopen(req,data)

#读取相应结果
while True:
    data = fd.read(1024)
    if not len(data):
        break
    #sys.stdout.write(data)
    print data

import sys,urllib,urllib2,getpass

#定义TerminalPwd类扩展HTTPPasswordMgr，允许在需要的时候询问操作员输入密码
class TerminalPwd(urllib2.HTTPPasswordMgr):
    def find_user_password(self,realm,authuri):
        retval = urllib2.HTTPPasswordMgr.find_user_password(self,realm,authuri)
        
        if retval[0] == None and retval[1] == None:
            #didn‘t find it in stored values
            username = input("Login required,please input username:")
            password = input("please input password:")
            return(username,password)
        else:
            return retval


url = "http://home.asiainfo.com/"
req = urllib2.Request(url)
#需要加载额外的处理时需要使用opener，比如此处需要支持认证处理
#如果需要认证，会自动调用TerminalPwd里面的函数，如果不需要进一步检查和普通的请求一样
opener =  urllib2.build_opener(urllib2.HTTPBasicAuthHandler(TerminalPwd()))

#请求
fd = opener.open(req)

print ("URL Retrieved:",fd.geturl())
info = fd.info()
for key, value in info.items():
    print "%s           =              %s" % (key,value)