对文件中的ip取C段并去重写入文件

实现功能：对ip.txt中的ip取C段并去重，写入新的txt文件中

#coding=utf-8#列表ipc用于存储对ip取前三位的C段结果ipc=[]with open("ip.txt","r") as f1:            for line in f1:                line=line.rstrip()                line=line.split('.')                ipc.append(line[0]+"."+line[1]+"."+line[2])            print ipc#set()对列表ipc去重ipc=set(ipc)print ipc#将列表ipc写入ipc.txt中with open("ipc.txt","a") as f2:    for ip in ipc:        f2.write(ip+"\n")

运行结果：输入文件ip.txt，输出文件ipc.txt为对ip.txt中ip取c段并去重后的结果

在执行set(ipc)前后的print ipc结果不同，第二次是去重后的ipc段

['110.75.139', '112.25.59', '112.25.59', '110.75.129', '110.75.144', '103.52.197', '110.75.129', '103.52.199', '140.205.76', '110.75.129', '110.75.129']['110.75.139', '112.25.59', '110.75.129', '110.75.144', '103.52.197', '103.52.199', '140.205.76']

上面使用了set()对列表做去重，比较方便，也可以使用for循环的方式

#coding=utf-8ipc=[]with open("ip.txt","r") as f1:            for line in f1:                line=line.rstrip()                line=line.split('.')                ipc.append(line[0]+"."+line[1]+"."+line[2])            print ipc#对ipc段的列表ipc使用for循环的方式去重，得到ip_quchongip_quchong=[]for ip in ipc:if ip in ip_quchong:passelse:ip_quchong.append(ip)print ip_quchongwith open("ipc.txt","a") as f2:    for ip in ip_quchong:        f2.write(ip+"\n")