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did you already try doing what the error message suggests?

have you been able to use pulumi successfully before this?

yes, i have create ec2 and rds by pulumi last week

Does your Pulumi.yaml have an "options: venv: ..." setting?

That tells pulumi that it expects a python virtual environment folder to be present at "./venv" and that virtual environment should be what has the pulumi python module installed in it

<https://docs.python.org/3/tutorial/venv.html>

Or create a venv. Depends how you like to use python, pulumi doesn't enforce anything here.