Python实现shell sed替换简单的功能

f = open('yesterday','r',encoding='utf-8')

f2 = open('yesterday.bak','w',encoding='utf-8')

old_str = input('请输入要修改的字符：')

replace_str = input('请输入替换成的字符:')

for line in f.readlines():

 line = line.replace(old_str,replace_str)

 print(line)

 f2.write(line)

f.close()

f2.close()

Somehow, it seems the love I knew was always the most destructive kind

不知为何，我经历的爱情总是最具毁灭性的的那种

Yesterday when I was young

昨日当我年少轻狂

The taste of life was sweet

生命的滋味是甜的

As rain upon my tongue

就如舌尖上的雨露