Sort subdirectories of a directory by the most recent file dates with them

lastused.py

#! /usr/bin/env python3

import os
import pathlib
import argparse
import datetime
from collections import defaultdict

parser = argparse.ArgumentParser(description='Sort subdirectories by most recent files within them')
parser.add_argument('-v', '--verbose', help="be verbose", action='store_true')
parser.add_argument('dirs', nargs='+', metavar='DIR', help="directory to scan")

args = parser.parse_args()

for path in args.dirs:
    f = pathlib.PosixPath(path)
    n = len(f.parts)
    print(path)

    latest = defaultdict(lambda: 0)

    for f in pathlib.Path(path).glob('**/*'):
        assert len(f.parts) > n

        if len(f.parts) == n + 1 and not f.is_dir():
            continue

        st = f.lstat()
        # t = max(st.st_ctime, st.st_mtime)
        t = st.st_mtime

        part = f.parts[n]
        latest[part] = max(t, latest[part])

        if args.verbose:
            print("{:30} {}   {}".format(part, datetime.datetime.fromtimestamp(t).ctime(), os.path.join(*f.parts[n:])))

    latest = sorted([(v, k) for k, v in latest.items()])

    for v, k in latest:
        print("    {}  {}".format(datetime.datetime.fromtimestamp(v).ctime(), k))