python2判断编码格式

 def getCoding(strInput):
     '''
     获取编码格式
     '''
     if isinstance(strInput, unicode):
         return "unicode"
     try:
         strInput.decode("utf8")
         return 'utf8'
     except:
         pass
     try:
         strInput.decode("gbk")
         return 'gbk'
     except:
         pass

 def tran2UTF8(strInput):
     '''
     转化为utf8格式
     '''
     strCodingFmt = getCoding(strInput)
     if strCodingFmt == "utf8":
         return strInput
     elif strCodingFmt == "unicode":
         return strInput.encode("utf8")
     elif strCodingFmt == "gbk":
         return strInput.decode("gbk").encode("utf8")

 def tran2GBK(strInput):
     '''
     转化为gbk格式
     '''
     strCodingFmt = getCoding(strInput)
     if strCodingFmt == "gbk":
         return strInput
     elif strCodingFmt == "unicode":
         return strInput.encode("gbk")
     elif strCodingFmt == "utf8":
         return strInput.decode("utf8").encode("gbk")