python 16进制string 转string
refs:http://blog.csdn.net/u011546806/article/details/45370069str = "7B 7D 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 32 0F 10 0A 4B 4C 00 00 00 00 00 00 00 00 3F 21"def GetCmd(hexString):