move files

import sys, os, shutil
import datetime

dir_register = set()

def run(in_dir, out_dir):
    for root, dirs, files in os.walk(in_dir):
        for f in files:
            _path = os.path.join(root, f)
            _ctime = os.path.getmtime(_path)
            dt = datetime.datetime.fromtimestamp(_ctime)
            year = dt.year
            month = dt.strftime('%b')
            day = dt.day
            base_name = os.path.basename(f)
            new_dir = os.path.join(out_dir, str(year), month, str(day))
            if new_dir not in dir_register:
                if not os.path.exists(new_dir):
                    os.makedirs(new_dir)
                dir_register.add(new_dir)
            new_path = os.path.join(new_dir, base_name)
            shutil.move(_path, new_path)

if __name__ == "__main__":
    in_dir = 'tmp'
    out_dir = 'sorted'
    run(in_dir, out_dir)