进制转化

class DateTransfer():
    # ==================================================================================================================
    # 二进制、十进制、十六进制、数字、字符串相互转换
    # 将16进制字符串转化为对应的数字
    def str2hex(self, s):
        data = 0
        su = s.upper()
        for _ in su:
            data = data << 4
            if _ <= '9':
                data = data + ord(_) - ord('0')
            elif 'A' <= _ <= 'G':
                data = data + ord(_) - ord('A') + 10
        return data
    # 将2进制字符串转化为对应的数字
    def str2bin(self, s):
        data = 0
        for _ in s:
            data = data << 1
            data = data + ord(_) - ord('0')
        return data
    # 将十六进制字符串转化为二进制字符串
    def hex2bin(self, s):
        data = self.str2hex(s)
        strbin = bin(data)[2:]
        if len(strbin) == 8:
            pass
        else:
            strbin = '0' * (8 - len(strbin)) + strbin
        return strbin
    # 将二进制字符串转化未十六进制字符串
    def bin2hex(self, b):
        orgbin = '0b' + b
        binstr = eval(orgbin)
        hexstr = str(hex(binstr))[2:]
        return hexstr