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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.

There's this `.pulumi/bin/pulumi-language-python-exec` which I don't understand and seems to be broken for some reason.

And pulumi disables the `pdb` debugger so I can't just set a breakpoint and figure out what's wrong.

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.

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

<@U04A8A1MJBD> 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

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