gistfile1.py

import os
import shutil
from datetime import datetime, date, timedelta


def get_next_date(base_date):
    next_month = date(base_date.year, base_date.month, 1) + timedelta(days=35)
    return date(next_month.year, next_month.month, 1)


def meka_dirs():
    start_date = date(2018, 9, 1)
    end_date = date.today()

    months = [start_date]
    a = start_date
    while(a < end_date):
        a = get_next_date(a)
        months.append(a)

    dir_names = [month.strftime("%Y年%m月") for month in months]
    for dir_name in dir_names:
        if not os.path.exists(dir_name):
            print(dir_name)
        os.makedirs(dir_name, exist_ok=True)


def main():
    meka_dirs()

    files = os.scandir()
    file_names = [file.name for file in files if file.is_file()]

    for file_name in file_names:
        tmp_file = "20" + file_name
        try:
            target_datetime = datetime.strptime(tmp_file, "%Y%m%d_%H%M_NHK第2.MP3")
            shutil.move(file_name, target_datetime.strftime("%Y年%m月"))
        except Exception as e:
            print(file_name)


if __name__ == "__main__":
    main()