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@glamorous-afternoon-59004 you’re gonna have a lot easier time if you use something with intellisense and use the python typings. I threw this together real quick, it’s untested:

"""An AWS Python Pulumi program"""

import pulumi
import pulumi_aws as aws


provider = aws.Provider(
    "assume_role",
    aws.ProviderArgs(
        assume_role=aws.ProviderAssumeRoleArgs(
            role_arn="role.arn", session_name="something"
        ),
        region="us-west-2",
    ),
)

identity = aws.get_caller_identity(pulumi.InvokeOptions(provider=provider))
arn = identity.arn