Python UNICODE GBK UTF-8 之间相互转换

Python 编码格式检测，可以使用 chardet ，

例如： 

　　　　

import urllib
rawdata = urllib.urlopen('http://www.google.cn/').read()
import chardet
print chardet.detect(rawdata)

输出结果是：
    {'confidence': 0.98999999999999999, 'encoding': 'GB2312'}

# win下命令行参数为gbk编码：star.gbk2unicode(sys.argv[1]) + u'也有'
def gbk2unicode(s):
    return s.decode('gbk', 'ignore')

# 脚本文件#coding:utf-8时默认不带u的字符串为utf8字符串：star.utf82unicode('我')
def utf82unicode(s):
    return s.decode('utf-8', 'ignore')

# 带u的字符串为unicode
# star.unicode2gbk(u'u4e5fu6709')
# star.unicode2gbk(u'也有')
def unicode2gbk(s):
    return s.encode('gbk')

# 带u的字符串为unicode
# star.unicode2utf8(u'u4e5fu6709')
# star.unicode2utf8(u'也有')
def unicode2utf8(s):
    return s.encode('utf-8')

# win下命令行参数为gbk编码：star.gbk2utf8(sys.argv[1]) + '也有'
def gbk2utf8(s):
    return s.decode('gbk', 'ignore').encode('utf-8')

def utf82gbk(s):
    return s.decode('utf-8', 'ignore').encode('gbk')