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The pulumi CLI/engine is different from the pulumi SDK. You

brew install pulumi

to obtain the CLI whereas

pulumi

in your requirements.txt refers to the Python-specific SDK. When you run

pulumi up

it spins up both the engine and a language host. The latter executes your python program within your specified python environment. The diagram in https://www.pulumi.com/docs/intro/concepts/how-pulumi-works/ provides a useful diagram and more details.

Thanks for the help! Then I still wonder, why

prefect_kubernetes

can not be imported, as it is installed in my conda environment, and if I understand the pulumi setup correctly, it should therefore be loaded from the conda environment, right? 🤔

Are you executing

pulumi

from within the shell that has an active conda environment?

Yes, but it doesn’t seem to load the packages from the conda environment

Pulumi doesn’t try to do anything special from a python environment perspective. It picks up the first

python

on your

PATH

(see https://github.com/pulumi/pulumi/blob/b364296521a8b945ab37874f5c79de770d29d718/sdk/python/python.go#L32) If you’re able to provide a reliable repro of not using the right python (and right virtual environment), I’d be happy to take a look.