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I'll answer my own question for now. The answer is here: <https://www.pulumi.com/docs/intro/concepts/programming-model/#apply>

```userScript_built = userScript.replace('&lt;BUCKET_NAME&gt;', bucket.id)```
becomes something like:
```userScript_built = bucket.id.apply(lambda id: userScript.replace('&lt;BUCKET_NAME&gt;', id))```