= In `shell.nix`

[source,nix,linenums]
.shell.nix
....
include::shell.nix[]
....

Here's a short Python program that uses it.

[source,python,linenums]
.Main.hs
....
include::Main.py[]
....

Here's a demonstration using the program.

....
$# echo '$ nix-shell'
$# nix-shell --run bash <<EOL
$ python Main.py
$# EOL
....