AWS Lambda function for getting values from query string

getQueryStringElement.py

def getQueryStringElement(element, event, default=None):

    if event is None:
        return default
    elif not('queryStringParameters' in event):
        return default
    if event['queryStringParameters'] is None:
        return default
    elif element in event['queryStringParameters']:
        return event['queryStringParameters'].get(element)
    else:
        return default