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documentation: show combining python35.withPackages and mkShell

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this had me stumped - thanks to adisbladis on irc
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Arnout Engelen 2019-11-09 10:25:57 +01:00 committed by Frederik Rietdijk
parent 911fe47772
commit 7eddc92374
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18
doc/languages-frameworks/python.section.md
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@ -144,6 +144,24 @@ What's happening here?
2. Then we create a Python 3.5 environment with the `withPackages` function.
3. The `withPackages` function expects us to provide a function as an argument that takes the set of all python packages and returns a list of packages to include in the environment. Here, we select the packages `numpy` and `toolz` from the package set.
To combine this with `mkShell` you can:
```nix
with import <nixpkgs> {};
let
pythonEnv = python35.withPackages (ps: [
ps.numpy
ps.toolz
]);
in mkShell {
buildInputs = [
pythonEnv
hello
];
}
```
##### Execute command with `--run`
A convenient option with `nix-shell` is the `--run`
option, with which you can execute a command in the `nix-shell`. We can