Python: Difference between revisions

@@ Line 11: / Line 11: @@
 # shell.nix
 let
-   pkgs = import <nixpkgs> {};
+  # We pin to a specific nixpkgs commit for reproducibility.
+  # Last updated: 2024-04-29. Check for new commits at https://status.nixos.org.
+   pkgs = import (fetchTarball "https://github.com/NixOS/nixpkgs/archive/cf8cc1201be8bc71b7cbbbdaf349b22f4f99c7ae.tar.gz") {};
 in pkgs.mkShell {
    packages = [
@@ Line 28: / Line 30: @@
 Once you have picked the Python packages you want, run <code>nix-shell</code> (or <code>nix develop -f shell.nix</code>)  to build the Python environment and enter it. Once in the environment Python will be available in your PATH, so you can run eg. <code>python --version</code>.
-As a word of warning, using <code>pkgs = import <nixpkgs> {};</code> as in the snippet above (line 3) will result in a non-reproducible environment. Use Nixpkgs pinning or Nix Flakes to make your environment reproducible.
 ==== Using a Python packages not in Nixpkgs ====