python 网络编程

一.DNS 查询IP地址

import sys,socket
result=socket.getaddrinfo(sys.argv[1],None,0,socket.SOCK_STREAM)
counter=0
for item in result:
    print "%-2d: %s" % (counter,item[4])
    counter+=1

二.IPV6

import socket,sys
host,port=sys.argv[1:]
results=socket.getaddrinfo(host,port,0,socket.SOCK_STREAM)
for result in results:
    print "-" * 60
    if result[0] == socket.AF_INET:
        print "AF_INET"
    elif result[0] == socket.AF_INET6:
        print "AF_INET6"
    else:
        print result[0]
    if result[1] == socket.SOCK_STREAM:
        print "SOCK_STREAM"
    elif result[1] == socket.SOCK_DGRAM:
        print "SOCK_DGRAM"
    print "Protocol:" ,result[2]
    print "Socket Address:",result[4]

三.Web 访问

urllib2扩展性更好,有更多的内置特性

3.1 获取Web页面

import sys,urllib2
req=urllib2.Request(sys.argv[1])
fd=urllib2.urlopen(req)
while 1:
    data=fd.read(1024)
    if not len(data):
        break
    sys.stdout.write(data)

3.2 判断邮箱格式是否正确

def ValidateEmail(email):
    if len(email) > 7:
        if re.match("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$", email) != None:
            return 1
    return 0

四.发送POST消息

#!/usr/bin/python  
#coding=utf-8  
  
import urllib  
import urllib2,time
  
def post(url, data):  
    req = urllib2.Request(url)  
    data = urllib.urlencode(data)  
    opener = urllib2.build_opener(urllib2.HTTPCookieProcessor())  
    response = opener.open(req, data)  
    return response.read()  
  
def fun(user,pwd):  
    posturl = "http://www.xxx.com/login.php"  
    data = {'username':user, 'password':pwd}  
    ans=post(posturl, data)  
    print ans
    if len(ans)!=17:
        print pwd
    else:
        print len(ans)
if __name__ == '__main__':  
    fun("myusername","mypassword")

五.调用Google翻译

# -*- coding: utf-8 -*-
import re
import urllib,urllib2
def translate(text):
    '''模拟浏览器的行为，向Google Translate的主页发送数据，然后抓取翻译结果 '''
    #text 输入要翻译的英文句子
    text_1=text
    #'langpair':'en'|'zh-CN'从英语到简体中文
    values={'hl':'zh-CN','ie':'UTF-8','text':text_1,'langpair':"'en'|'zh-CN'"}
    url='http://translate.google.cn/translate_t'
    data = urllib.urlencode(values)
    req = urllib2.Request(url,data)
    #模拟一个浏览器
    browser='Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)'
    req.add_header('User-Agent',browser)
    #向谷歌翻译发送请求
    response = urllib2.urlopen(req)
    #读取返回页面
    html=response.read()
    #从返回页面中过滤出翻译后的文本
    #使用正则表达式匹配
    #翻译后的文本是'TRANSLATED_TEXT='等号后面的内容
    #.*? non-greedy or minimal fashion
    #(?<=...)Matches if the current position in the string is preceded
    #by a match for ... that ends at the current position
    p=re.compile(r"(?<=TRANSLATED_TEXT=).*?;")
    m=p.search(html)
    text_2=m.group(0).strip(';')
    return text_2
if __name__ == "__main__":
    #text_1 原文
    text_1=open('c:\\Users\\nwg\\Desktop\\192.168.210.228.html','r').read()
#    print('The input text: %s' % text_1)
    text_2=translate(text_1).strip("'")
    print('The output text: %s' % text_2)
    #保存结果
    filename='c:\\Users\\nwg\\Desktop\\my.html'
    fp=open(filename,'w')
    fp.write(text_2)
    fp.close()
    report='Master, I have done the work and saved the translation at '+filename+'.'
    print('Report: %s' % report)

IMAP访问邮箱

import imaplib
def fun(user,password):
      mail=imaplib.IMAP4_SSL('mail.ihep.ac.cn')
      try:
           mail.login(user,password)
           mail.logout()
      except imaplib.IMAP4.error,err:
           pass