def decode_str(data)

                return if data.length < 4
                slen = data.slice!(0,4).unpack("N")[0]


                return "" if slen == 0
                while (slen % 4 != 0)
                        slen += 1
                end

                data.slice!(0,slen).to_s.split("\x00")[0]

##### My python code ###########
def decode_str(data):
    if len(data) < 4:
        return

    slen = struct.unpack('!I', data[0:4])[0]

    if slen == 0:
        return ''

    while slen % 4 != 0:
        slen += 1

    data = data[4:]
    data = data[0:slen].split("\x00")[0]
    return data