python自学第6天，文件修改，字符编码

文件的修改：

一般是把旧文件的内容改了，在写入到新的文件中去。

file_old=open("test","r",encoding="utf-8")
file_new=open("test.bak","w",encoding="utf-8")

for line in file_old:
    if "快乐等我享受" in line:
        line=line.replace("快乐等我享受","快乐等HunterYi享受")
        print(line)
    file_new.write(line)
file_old.close()
file_new.close()

　　

with语句的用法。

#!/usr/bin/env python
#-*- coding:utf-8 -*-
# Author:Hunter Yi

with open("test","r",encoding="utf-8") as f ,\
     open("test.bak","r",encoding="utf-8") as f2: #用with语句 可以同时打开多个文件，用完后自动关闭。

    for line in f:
        print(line)

    for line2 in f2:
        print(line2)　　

查看当前编码

import sys
print(sys.getdefaultencoding())

编码转换

s_utf8="你好"
print(s_utf8.encode("utf-8"))
utf8_gbk=s_utf8.encode("gbk")
print(utf8_gbk)
gbk_gb2312=utf8_gbk.decode("gbk").encode("utf-8")
print(gbk_gb2312.decode("utf-8"))