Issue with Lambda function: Invalid type for parameter

Question

I'm writing an AWS Lambda function in Python and have an issue. Here is the relevant piece of code:

containerInstances = listContainerInstances['containerInstanceArns'][j]

containerInstancesDetails = ecs.describe_container_instances(cluster=cluster, containerInstances=containerInstances)

I get the following error:

Invalid type for parameter containerInstances, value: arn:aws:ecs:eu-west-1:11111111111:container-instance/11111111-1111-1111-1111-111111111111, type: <type 'unicode'>, valid types: <type 'list'>, <type 'tuple'>: ParamValidationError

Anyone knows how the fix this issue? Do i need to convert from unicode to list? If so, how? I tried several things which didn't help.

Please advise.

What happens if you remove the final [j] on the first line ? According to the error msg, containerInstances should be a tuple or a list, but you only pick up one item at index 'j', instead of the whole list. — sciroccorics
– sciroccorics, Commented Apr 10, 2018 at 15:29
I will get the whole list, While i want the result of just one of them. I'm able to use this specific command in CLI, which gives me the expected result. Please see here: docs.aws.amazon.com/cli/latest/reference/ecs/… (see their example). However, The same command doesn't work well in their SDK, Which expecting to a tulip or a list. See here: boto3.readthedocs.io/en/latest/reference/services/…. — Omri
– Omri, Commented Apr 10, 2018 at 15:46

Kal · Accepted Answer · 2018-04-10 16:32:44Z

1

I don't know AWS Lambda, but given @sciroccorics's hint, and assuming it works like you would expect Python to work, all you need to do is ensure that containerInstances is a list:

containerInstances = [listContainerInstances['containerInstanceArns'][j]]

should do the trick.

answered Apr 10, 2018 at 16:32

Kal

1,72915 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Omri Over a year ago

Awesome! So simple :-)

Collectives™ on Stack Overflow

Issue with Lambda function: Invalid type for parameter

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related