hexdump.py

def hexdump(data):
    """Pretty print a hex dump of data, similar to xxd"""
    lines = []
    offset = 0
    while offset < len(data):
        piece = data[offset:offset + 16]
        bytes = ''.join([('%02x ' % ord(x)) for x in piece])
        chars = ''.join([(x if 0x20 < ord(x) < 0x7f else '.') for x in piece])
        lines.append('%04x  %-24s %-24s %-16s' % (offset, bytes[:24], bytes[24:], chars))
        offset += len(piece)
    return "\n".join(lines)