Lambda function for iterating over a set of items as part of a step function.

iterator.py

#!/usr/bin/env python3

def lambda_handler(event, context):
    iterator = event['iterator']
    index = iterator['index']
    step = iterator['step']
    count = iterator['count']
    items = iterator['items']
    
    index += step
    
    return {'index': index, 'step': step, 'count': count, 'continue': index < count, 'items': items }