gistfile1.py

# coding: utf-8
import os
from PIL import Image
from glob import glob

flist = []
fhist = []
dl = []

dirname = './images/'

for e in ['png', 'jpg']: flist.extend(glob('%s/*.%s'%(dirname,e)))

for fn in flist: fhist.append(Image.open(fn).histogram())

for i in xrange(len(flist)):
  if flist[i] in dl: continue
  for j in xrange(i+1, len(flist)):
    if flist[j] in dl: continue
    if fhist[i] == fhist[j] and not flist[j] in dl:
      dl.append(flist[j])

for a in dl: os.remove(a)