Hi all. I’m having troubles using

tags

on AWS resource, and the error seems to be related the RPC python implementation…

pulumi up

fails with:

File "/<path-redacted>/python3.8/site-packages/pulumi/runtime/rpc.py", line 451, in translate_output_properties
        raise AssertionError(f"Unexpected type. Expected 'list' got '{typ}'")
    AssertionError: Unexpected type. Expected 'list' got '<class 'str'>'
    error: an unhandled error occurred: Program exited with non-zero exit code: 1

With this,

pulumi up

works:

for zone in zones.names:
    vpc_subnet = ec2.Subnet(
        f'vpc-subnet-{zone}',
        assign_ipv6_address_on_creation=False,
        vpc_id=vpc.id,
        map_public_ip_on_launch=True,
        cidr_block=f'10.100.{len(subnet_ids)}.0/24',
        availability_zone= zone,
        tags={
            'Name' : f'pulumi-sn-{zone}'
        }
    )

With this, it doesn’t:

for zone in zones.names:
    vpc_subnet = ec2.Subnet(
        f'vpc-subnet-{zone}',
        assign_ipv6_address_on_creation=False,
        vpc_id=vpc.id,
        map_public_ip_on_launch=True,
        cidr_block=f'10.100.{len(subnet_ids)}.0/24',
        availability_zone= zone,
        tags={
            'Name' : f'pulumi-sn-{zone}',
            'new-tag': 'new-value'  # <---- this is the only change
        }
    )

Any ideas/suggestions on what might be going on here?

Hi @many-psychiatrist-74327, I’ve reproduced the problem. It looks like it’s due to some extra type checks we added in the

pulumi

Python SDK in v2.9.0, which fails when certain values come back from the engine that aren’t expected. I’m going to open an issue and work on a fix. In the meantime, you can workaround by downgrading you Python package dependencies to

pulumi

v2.8.2 and

pulumi_aws

v3.1.0.

Hi @microscopic-pilot-97530! Thanks for taking a look!

Thanks, also posting responses there.