2023-11-13 17:27:17 +00:00
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---
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date: '2023-11-13T18:21:46+01:00'
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title: 'Nix Recipe for Python Projects'
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2023-11-13 17:30:13 +00:00
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tags:
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- nix
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- python
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2023-11-13 17:27:17 +00:00
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---
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This is a quick and easy recipe to add a `default.nix` to any Python project with a `requirements.txt` file:
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2023-11-13 17:30:13 +00:00
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<!--more-->
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2023-11-13 17:27:17 +00:00
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```nix
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with import <nixpkgs> { };
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let
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pythonPackages = python311Packages;
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in pkgs.mkShell rec {
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name = "impurePythonEnv";
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venvDir = "./.venv";
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buildInputs = [
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# A python interpreter including the 'venv' module is required to bootstrap
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# the environment.
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pythonPackages.python
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# This execute some shell code to initialize a venv in $venvDir before
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# dropping into the shell
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pythonPackages.venvShellHook
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# Those are dependencies that we would like to use from nixpkgs, which will
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# add them to PYTHONPATH and thus make them accessible from within the venv.
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pythonPackages.numpy
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pythonPackages.requests
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# In this particular example, in order to compile any binary extensions they may
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# require, the python modules listed in the hypothetical requirements.txt need
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# the following packages to be installed locally:
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taglib
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openssl
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git
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libxml2
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libxslt
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libzip
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zlib
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];
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# Now we can execute any commands within the virtual environment.
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# This is optional and can be left out to run pip manually.
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postShellHook = ''
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pip install -r requirements.txt
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'';
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}
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```
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Now, you will get a clean environment by running:
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```
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nix-shell
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```
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