#Python2

 #-*-  coding:utf-8 -*-

 s = "你好"

 s_to_unicode = s.decode("utfi-8")

 s_to_gbk = s.decode("utf-8").encode("gbk") #先用指定码表解码,再用指定码表编码

 print(s_to_bgk)

 print(s_to_unicode)

 gbk_to_utf8 = s_to_gbk.decode("gbk").encode("utf-8")

 print(gbk_to_utf8)

 s1 = u"你好"  ＃前面加ｕ代表码表是Unicode

 print(s1)

 # 打印系统默认编码

 import sys

 print(sys.getdefaultencoding())

# -*- encoding: utf-8 -*-

#Python3 默认码表是Unicode

s = "你好" (Unicode,因为Python3默认数据的码表是Unicode. 改文件码表不影响其内容的数据存储形式)

s_gbk = s.encode("gbk")

print(s_gbk)  # gbk

print(s.encode())  # utf-8

gbk_to_utf8 =  s_gbk.decode("gbk").encode("utf-8")

print("utf8",gbk_to_utf8)

 s = "你好"

 print(s.encode("utf-8").decode("utf-8).encode("gb2312").decode("gb2312")) #encode("gb2312")后变成bytes; 之后再decode("gb2312")又转成字符串