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Python Python for File Systems Manipulation Purging


How should I answer this question?

import os
import re
import dateutil.parser
import datetime

def delete_by_date(date):
    for thing in os.scandir('backups'):
        if thing.is_file():
            date = dateutil.parser.parse(re.search(r'\d{2,4}-\d{2,4}-\d{2,4}', thing).group()).strftime('%Y-%m-%d')
            username = re.search(r'[\w\d]*\d{3-12}', thing).group()
            ext = re.search(r'\.[\w\d]*', thing).group()
            filename = date + '-' + username + "." + ext