#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")
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