Default channel should be “stable-24.05” otherwise a lot of things does not work by default.
Try to add python312 packages with current default channel …

pkgs.python312
pkgs.python312Packages.pip
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Good point, we’ve been trying to update the default channels. Which template did you use that had an older channel?

@Alex I’ve imported repository from github

@Alex probably wanted to know how you populated your .nix/dev.nix, @Tomasz_Drobiszewski

Did you copy & paste from the web or use the “Create a default dev.nix file?” dialog that can appear bottom right?

@Alex @perguth I’ve use defaults everywhere.

The channels should be updated now for internal templates and I have a PR out and testing the external ones!