Python in Replit - No module named pytest

I am trying to start coding the first Python project, but Replit is against me. I tried several times to import freeCodeCamp starter template, but all the times, when I press Run or run “python main.py” it says “No module named ‘pytest’”.

The replit.nix file is correct, as follows:
deps = [
pkgs.python38Full
pkgs.python38Packages.pytest
];

So… what’s the problem?

Thanks in advance.

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Challenge: Scientific Computing with Python Projects - Arithmetic Formatter

Link to the challenge:

Hey, try approach that is in the following post - Loading nix environment doesn't stop - #4 by sanity

I’ve done the three steps and now I’m at this point:

./bolilerplate is empty, replit.nix is correct (?), main.py still gives no module “pytest”

I’ve tried repeating your steps. The Run button at the top, or run python main.py, but in the Console should work.