How do I parse out value from AWS Lambda python response?

Question

Im trying to get the "counter_value" number to be passed into my API gateway. This is what is currently passed in when I return response from my lambda function

{"Attributes": {"counter_value": {"N": "89"}}, "ResponseMetadata": {"RequestId": "OOQNNHDS4S5E2IPHHA6PHVGS0JVV4KQNSO5AEMVJF66Q9ASUAAJG", "HTTPStatusCode": 200, "HTTPHeaders": {"server": "Server", "date": "Tue, 21 Jul 2020 01:58:26 GMT", "content-type": "application/x-amz-json-1.0", "content-length": "43", "connection": "keep-alive", "x-amzn-requestid": "OOQNNHDS4S5E2IPHHA6PHVGS0JVV4KQNSO5AEMVJF66Q9ASUAAJG", "x-amz-crc32": "897850636"}, "RetryAttempts": 0}}

Here is my Lambda Function(Python)

import boto3
def lambda_handler(event, context):
    dynamodb = boto3.client('dynamodb')
    
    response = dynamodb.update_item(
        TableName = 'Ordeproject',
        Key = {
            'id': {'S':'counter'}
        },
        UpdateExpression = 'SET counter_value = counter_value + :add',
        ExpressionAttributeValues = {
            ':add': {'N':'1'}
        },
        ReturnValues = "UPDATED_NEW"
    )
    print("UPDATING ITEM")
    print(response)
    return response

Marcin · Accepted Answer · 2020-07-21 02:31:27Z

2

Maybe I misunderstand the issue, but to get the counter_value from response you can do the following:

counter_value = response['Attributes']['counter_value']['N']

answered Jul 21, 2020 at 2:31

Marcin

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2 Comments

Ordep81 Over a year ago

That was exactly what I was trying to do!

Marcin Over a year ago

@Ordep81 Happy to hear that:-) Thanks

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