import os
import hashlib

hashes = {}
for root, dirs, files in os.walk("."):
    for f in files:
        if not f.endswith(".png"):
            continue
        fname = os.path.join(root, f)
        with open(fname, "rb") as openf:
            h = hashlib.md5(openf.read()).hexdigest()
            if hashes.get(h) is not None:
                print(fname, hashes.get(h))
                continue
            else:
                hashes[h] = fname