I feel like this has to be an FAQ because I keep running into it but googling isn't helping. I get

ModuleNotFoundError

when running

pulumi up

on built in libraries like

import pulumi_eks

What does 'pip list' return for you? If that library is not in the list you need to install it. https://pypi.org/project/pulumi-eks/

Yeah, I wish it was that simple. I have pip installed the missing library. But the pulumi CLI manages its own python environment somewhere. So when I run

pip install pulumi_eks

it goes into my python environment, not pulumi's.

Are you using python virtual environments? That is all I am using, pretty much cookie cutter environment.

I use conda/mamba normally. And that interaction is perhaps why things are going south.

To use the built-in virtual env with the pulumi program you would do something like

venv/bin/pip install pulumi_eks

in the root of the pulumi program.

That worked. Thanks.

This doc has some info about how to handle your python environment https://www.pulumi.com/docs/intro/languages/python/#pypi-packages

@thankful-stone-34269 to elaborate, by default when you do

pulumi new python

it creates a virtual env that it looks for (you can see the path to it in

Pulumi.yaml

If you’re using

conda

you may not want to use the venv

Makes sense - I appreciate it.

pulumi-language-python-exec is the language host, which is responsible for booting the Python interpreter and connecting it to the Pulumi CLI.