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# Dev environments {#dev-environments}
Create a `shell.nix` with the following:
```nix
# shell.nix
let
nixpkgs = fetchTarball "https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz";
pkgs = import nixpkgs { };
in
pkgs.mkShell {
packages = [ pkgs.python3 ];
shellHook = ''
echo "Welcome in my nix shell"
'';
}
```
run
```sh
nix-shell
```
This activates your `shell.nix` and you should see:
```sh
unpacking 'https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz' into the Git cache...
Welcome in your nix shell
```
python3 is available
```sh
$ python3 --version
```
To leave the shell
```bash
ctrl+D
```
:::{.note}
You should use [pinned nixpkgs](https://nix.dev/guides/recipes/dependency-management.html).
The example used `unstable` here for demonstration purposes only
:::
For further information check out [nix-shell](https://nix.dev/manual/nix/stable/command-ref/nix-shell)
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