python自学第17天之文件修改

#先准备文件 => 打开目标文件

#引入模块

import os

import time

with open("修改的目标文件",mode="r",encoding = "utf-8") as f1,\
    open("修改的目标文件_副本",mode="w",encoding="utf-8") as f2:

    for line in f1:
        line = line.replace("alex","sb")
        f2.write(line)

#删除文件

os.remove("修改的目标文件")
time.sleeep(3)
os.rename("修改的目标文件_副本","修改的目标文件")