Copy all data (by scanning) from one DynamoDB table to another

dynamodbcp.py

from __future__ import print_function

import argparse
import boto3

def copy_table(source, target):
    dynamodb = boto3.resource("dynamodb")
    source_table = dynamodb.Table(source)
    target_table = dynamodb.Table(target)

    records = source_table.scan()
    with target_table.batch_writer() as batch:
        for item in records["Items"]:
            print('copying record {}', item)
            batch.put_item(item)

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("source", help="Source table name")
    parser.add_argument("target", help="target table name")
    args = parser.parse_args()
    print('copying items from {} to {}', args.source, args.target)
    copy_table(args.source, args.target)