Didn't understand it at first, but now I think it's a pretty clever/decent solution.

Just a bit more verbose than one might like...

At first I had reservations about the fact that this requires you to pass a hash ... or rather, once you start using a hash as your "list", you can't just "switch back" to an array (a "problem" I've noticed in RSpec, where you have some tags that are symbols, and some that are hashes: you have to list the symbols first: describe 'thing', :happy_path, driver: :chrome):

{}.bury(users: Array, 0, 'Value')

But I think that's okay in practice. Just use a hash for all "elements" in your list:

{}.bury(users: Array, 0 => 'Value')

No docs?!

[ Some docs here; First saw it here: ] https://bugs.ruby-lang.org/issues/11747#note-7

equivalent in javascript:

{a, b, ...rest} = {a: 1, b: 2, c: 3, d: 4}

Not a bad replacement for that! I still find javascript's syntax a little more easily readable and natural, but given that we can't use the same syntax (probably because it would be incompatible with existing syntax rules that we can't break for compatibility reasons, unfortunately), this is a pretty good compromise/solution that they've come up with.

具体实现：

#!/usr/bin/python

import glob
import os
import sys

from PIL import Image

EXTS = 'jpg', 'jpeg', 'JPG', 'JPEG', 'gif', 'GIF', 'png', 'PNG'

def avhash(im):
    if not isinstance(im, Image.Image):
        im = Image.open(im)
    im = im.resize((8, 8), Image.ANTIALIAS).convert('L')
    avg = reduce(lambda x, y: x + y, im.getdata()) / 64.
    return reduce(lambda x, (y, z): x | (z << y),
                  enumerate(map(lambda i: 0 if i < avg else 1, im.getdata())),
                  0)

def hamming(h1, h2):
    h, d = 0, h1 ^ h2
    while d:
        h += 1
        d &= d - 1
    return h

if __name__ == '__main__':
    if len(sys.argv) <= 1 or len(sys.argv) > 3:
        print "Usage: %s image.jpg [dir]" % sys.argv[0]
    else:
        im, wd = sys.argv[1], '.' if len(sys.argv) < 3 else sys.argv[2]
        h = avhash(im)

        os.chdir(wd)
        images = []
        for ext in EXTS:
            images.extend(glob.glob('*.%s' % ext))

        seq = []
        prog = int(len(images) > 50 and sys.stdout.isatty())
        for f in images:
            seq.append((f, hamming(avhash(f), h)))
            if prog:
                perc = 100. * prog / len(images)
                x = int(2 * perc / 5)
                print '\rCalculating... [' + '#' * x + ' ' * (40 - x) + ']',
                print '%.2f%%' % perc, '(%d/%d)' % (prog, len(images)),
                sys.stdout.flush()
                prog += 1

        if prog: print
        for f, ham in sorted(seq, key=lambda i: i[1]):
            print "%d\t%s" % (ham, f)

参考代码：

1. http://www.ruanyifeng.com/blog/2011/07/imgHash.txt