A lambda function to perform cron tasks, this one deletes cloudformation stacks. Fill in REGEX with a regular expression for the CF stack name you wish to delete.

lambda_cron.py

import sys
import boto3
import re

def lambda_handler(event, context):
    cloudformation = boto3.client('cloudformation')
    stacks = cloudformation.describe_stacks()['Stacks']
    
    for s in stacks:
        if re.match(REGEX, s['StackName'], flags=0):
            response = cloudformation.delete_stack(StackName=s['StackName'])
            return "Deleting stack {}".format(s['StackName'])