code：
1 f = open('yesterday','r',encoding='utf-8') 2 f2 = open('yesterday.bak','w',encoding='utf-8') 3 old_str = input('请输入要修改的字符：') 4 replace_str = input('请输入替换成的字符:') 5 for line in f.readlines(): 6 line = line.replace(old_str,replace_str) 7 print(line) 8 f2.write(line) 9 f.close() 10 f2.close()
文件内容：（yesterday）
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
感想：
思路很简单就是打开源文件，然后循环，把源文件要替换的内容替换再写入新文件！