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What exactly did you want to get from this file? We don't directly provide that data through an API today - though you can read the file yourself if you need it. Would be very interested in the use case to understand what API would possibly make sense here.

In my case I wanted to run an external command and I wanted to know the location of Python's virtual env

I expect there is a way to ask Python to tell you what

venv

it is running in? If so, that would be another solution independent of opening and parsing the

Pulumi.yaml

yourself.

This works

os.path.dirname(sys.executable)

. Fortunately I don't need this anymore and can stay on Pulumi code alone. But thanks for the idea!