Check duplicate file size

check_dup_filesize.py

import os
import sys
from pprint import pprint as pp

path = sys.argv[1]
size_dict = {}

for _, _, files in os.walk(path):
    for f in files:
        size = os.path.getsize("%s/%s" % (path, f))
        v = size_dict.get(size, [])
        v.append(f)
        size_dict[size] = v

out = [ v for k, v in size_dict.items() if len(v) > 1 ]
pp(out)