Python自动化开发—EX.3(实简单的shell sed功能)

#程序1: 实现简单的shell sed替换功能

import sys,os
old_file = open('test.txt','r',encoding='utf-8')
new_file = open('test_bak.txt','w',encoding='utf-8')
old_line = input('替换前内容>>:')
new_line = input('替换后内容>>:')


for line in old_file:
    #print(line.strip())
    if old_line in line:
        line = line.replace(old_line,new_line)
    new_file.write(line)
old_file.close()
new_file.close()