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Can be used to set up per dir environments, e.g using direnv to automatically activate them.
## Python
https://nixos.org/manual/nixpkgs/stable/#python
```nix
{ pkgs ? import <nixpkgs> {}}:
pkgs.mkShell {
packages = [ pkgs.virtualenv ];
}
```
```nix
with import <nixpkgs> {};
let
my_toolz = python311.pkgs.buildPythonPackage rec {
pname = "toolz";
version = "0.10.0";
pyproject = true;
src = fetchPypi {
inherit pname version;
hash = "sha256-CP3V73yWSArRHBLUct4hrNMjWZlvaaUlkpm1QP66RWA=";
};
nativeBuildInputs = [
python311.pkgs.setuptools
python311.pkgs.wheel
]; # has no tests
doCheck = false;
meta = {
homepage = "https://github.com/pytoolz/toolz/";
description = "List processing tools and functional utilities";
# [...]
};
};
in python311.withPackages (ps: with ps; [ numpy my_toolz ]) ).env
```
The [[keyword-import]] is required here because imports a nix expression from another source, in this case nixpkgs.
It is not required at line two, because python310Packages itself is already in the local scope.
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