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You’re getting the error trying access `bucket.arn` with something like:
```import pulumi
import pulumi_aws as aws

bucket = aws.s3.Bucket("newBucket")```
Maybe try `bucket.id` instead?

<@UTJ8T8L8H> I provided some guidance at <https://pulumi-community.slack.com/archives/CDE799L1M/p1593538890154200?thread_ts=1593508913.150500&amp;cid=CDE799L1M>.

I found a way to do it yesterday:
```policy = bucket.id.apply(lambda id:
            '''
            {{
...
               "Resource": "arn:aws:s3:::{my_id}/*"
...
'''.format(my_id=id)...```