Dictionary problem with aws lambda - Python

Question

I'm developing an AWS lambda function with Python 3.6 and facing an odd scenario.

Locally, calling the function with python-lambda-local everything works fine.

In AWS, the snippet below raises an exception:

def handler(event, context):
    data = event['body']
    logger.info("###DATAAAAA BODY " + str(data))
    origem = data.get('origem','')

Error:

AttributeError: 'str' object has no attribute 'get'

It seems that, locally, the object data is a dict. But in AWS it is a str.

You've assigned data to be event['body']. If that's a string, then you don't have a .get() method. Perhaps log the entire contents of the event and double-check what you're receiving? — g.d.d.c
– g.d.d.c, Commented Sep 25, 2018 at 19:56

Eduardo Briguenti Vieira · Accepted Answer · 2018-09-25 21:16:11Z

4

Thanks to the @g.d.d.c comment I could find the answer.

The problem is that API Gateway wrap the body value of the event with quotes.

So I have to parse it first to dict.

The correct code:

def handler(event, context):
    logger.info("###EVENT " + str(event))
    data = event.get('body')
    data = json.loads(data)

answered Sep 25, 2018 at 21:16

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