Python实现的txt文件去重功能示例

本文实例讲述了Python实现的txt文件去重功能。分享给大家供大家参考，具体如下：

# -*- coding:utf-8 -*-
#! python2
import shutil
a=0
readDir = "/Users/Administrator/Desktop/old.txt"  #old
writeDir = "/Users/Administrator/Desktop/new.txt" #new
# txtDir = "/home/Administrator/Desktop/１"
lines_seen = set()
outfile = open(writeDir, "w")
f = open(readDir, "r")
for line in f:
  if line not in lines_seen:
    a+=1
    outfile.write(line)
    lines_seen.add(line)
    print(a)
    print('\n')
outfile.close()
print("success")

其中old.tx如下：

3water.com
www.baidu.com
www.sina.com.cn
3water.com
www.google.com
www.sohu.com
3water.com
www.163.com

运行后new.txt内容如下：

3water.com
www.baidu.com
www.sina.com.cn
www.google.com
www.sohu.com
www.163.com