hexdump.py

def hex_dump(pdu):
    """ Useful routine to dump pdu, "xxd" way
    """
    import string
    length = 0x10
    for i in range(0, len(pdu) // length + 1):
        begin = i * length
        end = (i + 1) * length
        padding = " " * (length - len(pdu[begin:end])) * 3
        bytes_chunk = "".join("{:02x} ".format(ord(c)) for c in pdu[begin:end])
        ascii_repr = padding + "".join(a if a in string.printable[:-5] else "." for a in pdu[begin:end])
        print("{:08x}: {} {}".format(begin, bytes_chunk, ascii_repr))