Referencing the AWS account id in a troposphere stack

[DP]

Hi, 

When trying to reference an AWS account id (can't find a constant for it):

iam.ARN(account=Ref("AWS::AccountId"), resource="root"),

When I generate the template I get: 

"arn:aws:iam::<troposphere.Ref object at 0x7f5de89a4f50>:root"

Does anyone know how I can get the account id?

Thanks!

[Michael Barrett]

You should use Join() or Sub() to manually build the arn.  In a private project at my work, we use this to build the ARN for a bucket no matter whether a Ref or string is given:

https://gist.github.com/phobologic/879e40960a01031805c396952d846c15

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[Michael Barrett]

BTW, rather than using Ref() for the common constants, these exist in troposphere as well:

https://github.com/cloudtools/troposphere/blob/master/troposphere/__init__.py#L469