时间：2021-01-27 10:42:41 | 栏目：Python代码 | 点击：次
code：
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()
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！