Delete file and folders older than 7 days in "E:\usenet\tv\".

import os
import time

now = time.time()
for root, dirs, files in os.walk('E:\usenet\tv'):
    for f in files:
        if os.stat(os.path.join(root, f)).st_mtime < now - 7 * 86400:
            if os.path.isfile(os.path.join(root, f)):
                os.remove(os.path.join(root, f))
            else:
                shutil.rmtree(os.path.join(root, f))