python自學第6天

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檔案的修改：

一般是把舊檔案的內容改了，在寫入到新的檔案中去。

file_old=open("test","r",encoding="utf-8")file_new=open("test.bak","w",encoding="utf-8")for line in file_old:    if "快樂等我享受" in line:        line=line.replace("快樂等我享受","快樂等HunterYi享受")        print(line)    file_new.write(line)file_old.close()file_new.close()

　　

with語句的用法。

#!/usr/bin/env python#-*- coding:utf-8 -*-# Author:Hunter Yiwith open("test","r",encoding="utf-8") as f ,     open("test.bak","r",encoding="utf-8") as f2: #用with語句 可以同時開啟多個檔案，用完後自動關閉。    for line in f:        print(line)    for line2 in f2:        print(line2)

　　

python自學第6天