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You need to run pulumi programs via the pulumi cli, not via python directly.
Put that code:
```import pulumi
import pulumi_kubernetes as k8s

guestbook = k8s.yaml.ConfigFile('guestbook', 'guestbook-all-in-one.yaml')```
in it's own .py file and add a `Pulumi.yaml` file like:
```name: k8s
runtime: python```
and then run `pulumi up` in that directory.