バックアップファイルを徐々に間引くもの（3日以内は毎日残し、1週間を超えたら月曜日と1日だけ残し、31日を超えたら1日だけ残す）

backup_delete.py

#/usr/bin/python
# -*- coding: utf-8 -*-
import os
import datetime


BASE_DIR = './backup'
MOST_DAYS = 3


def before_datetime(days):
    # type: (int) -> datetime
    today = datetime.date.today()
    most_days = datetime.timedelta(days=days)
    judge_day = today - most_days
    t = datetime.time(0, 0, 0)
    judge_datetime = datetime.datetime.combine(judge_day, t)
    return judge_datetime


def isMostRecent(img_datetime):
    # type: (str) -> bool
    # True with in 3 days
    return img_datetime > before_datetime(MOST_DAYS)


def isWeeklyOr1st(img_datetime):
    # type: (str) -> bool
    # True with in 1 months
    if img_datetime < before_datetime(31):
        return False

    # monday is True
    if 0 == img_datetime.weekday():
        return True

    # or 1st day is True
    return 1 == img_datetime.day


def is1st(img_datetime):
    # type: (str) -> bool
    return 1 == img_datetime.day


def main():
    imgs = os.listdir(BASE_DIR)
    for img_path in imgs:
        path = os.path.join(BASE_DIR, img_path)
        mtime = os.stat(path).st_mtime
        img_datetime = datetime.datetime.fromtimestamp(mtime)
        if isMostRecent(img_datetime):
            print('most recent {}'.format(path))
            continue
        if isWeeklyOr1st(img_datetime):
            print('weekly or 1st {}'.format(path))
            continue
        if is1st(img_datetime):
            print('month 1st {}'.format(path))
            continue
        print('delete {}'.format(path))
        # os.remove(path)

if __name__ == '__main__':
    main()

make_test_date.py

#/usr/bin/python
# -*- coding: utf-8 -*-
import datetime
import subprocess

def touch(y, m, d):
    cmd = ['touch',
        '-d',
        '{}/{}/{}'.format(y, m, d),
        '{}{:02}{:02}.img'.format(y, m, d),
        ]
    p = subprocess.Popen(cmd)
    p.wait()


if __name__ == '__main__':
    today = datetime.date.today()
    for i in xrange(1000):
        d = today - datetime.timedelta(days=i)
        touch(d.year, d.month, d.day)