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How do you specify Python dependencies and their versions in Nix?

• soraminazuki 7y ago
  A quick and dirty way would be: $ nix run "(import <nixpkgs> {}).python37.withPackages([ pandas statsmodels ])" This would drop you into a shell with Python 3.7, pandas, and statsmodels installed. For more complex use cases, you should specify your dependencies in a shell.nix file or write your own nix package.
  • whateveracct 7y ago
    And then to expand, if you wish to pin one of those packages to a specific rev, the easiest way is to create an "overlay" (it's a Nix design pattern) that you apply to nixpkgs to override whatever version is in your nixpkgs version.