Purge all object versions from a bucket so terraform can destroy it

purge_bucket.py

#!/usr/bin/env python3

import argparse
import boto3

def main(bucket_name):
    session = boto3.Session()
    s3 = session.resource(service_name='s3')
    bucket = s3.Bucket(bucket_name)
    bucket.object_versions.delete()


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument('bucket_name')
    args = parser.parse_args()
    main(args.bucket_name)