count_file_types.py

import os
import sys

counts = dict()

for root, dirs, files in os.walk(sys.argv[1]):
    for filename in files:
        full_path = os.path.join(root, filename)
        base, ext = os.path.splitext(full_path)
        if len(ext) == 0:
            if '.git' in full_path:
                ext = '<git object>'
        counts[ext] = counts.setdefault(ext, 0) + 1

for k, v in sorted(counts.items(), key=lambda x:x[1], reverse=True):
    print(k, v)