hexdump implementation in Python

hexdump.py

import string

def hexdump(src, length=16, sep='.'):
	DISPLAY = string.digits + string.letters + string.punctuation
	FILTER = ''.join(((x if x in DISPLAY else '.') for x in map(chr, range(256))))
	lines = []
	for c in xrange(0, len(src), length):
		chars = src[c:c+length]
		hex = ' '.join(["%02x" % ord(x) for x in chars])
		if len(hex) > 24:
			hex = "%s %s" % (hex[:24], hex[24:])
		printable = ''.join(["%s" % FILTER[ord(x)] for x in chars])
		lines.append("%08x:  %-*s  |%s|\n" % (c, length*3, hex, printable))
	print ''.join(lines)
	
if __name__ == '__main__':
	data = ''.join(chr(x) for x in range(256))
	hexdump(data)

Updated from forked version:

• Use the character classes from string instead of the len(repr(chr(x))) == 3 trick which didn't work for backslash. This is clearer now.
• Just use FILTER when making the printable part; the ord(x) < 127 part was unnecessary, since FILTER contains 256 entries.

That's really a nice version of hexdump, since you can get it in the form of return and print it at once.