Create virtual environment with python interpreter

[mschneiderwng]

For PyCharm I need a (pseudo) virtual env which includes the python interpreter. For example, with mach-nix I can create an environment with the following content:

 venv
├──  bin
│  ├──  python3.9
│  └──  python3.9-config
├──  include -> /nix/store/dn4fwp0yx6nsa85cr20cwvdmg64xwmcy-python3-3.9.9/include
├──  lib
│  ├──  pkgconfig -> /nix/store/dn4fwp0yx6nsa85cr20cwvdmg64xwmcy-python3-3.9.9/lib/pkgconfig
│  ├──  python3.9
│  ├──  libpython3.9.so -> /nix/store/dn4fwp0yx6nsa85cr20cwvdmg64xwmcy-python3-3.9.9/lib/libpython3.9.so
│  ├──  libpython3.9.so.1.0 -> /nix/store/dn4fwp0yx6nsa85cr20cwvdmg64xwmcy-python3-3.9.9
│  └──  libpython3.so -> /nix/store/dn4fwp0yx6nsa85cr20cwvdmg64xwmcy-python3-3.9.9/lib/libpython3.so
└──  share -> /nix/store/dn4fwp0yx6nsa85cr20cwvdmg64xwmcy-python3-3.9.9/share

However, env.out only contains the python-packages, e.g.

 result
├──  matplotlib -> /nix/store/sk6yh7jm14l20i5yvq7s1i42llj818l4-matplotlib-3.4.3-python38-out
├──  numpy -> /nix/store/rwsiy56hgljf7qm50havh22bx18g0b4l-numpy-1.21.2-python38-out
└──  threadpoolctl -> /nix/store/xqpc4pdcil4i80myf8s6yghjrli0zpn6-threadpoolctl-2.2.0-python38-out

Is it possible to create a derivation with a kind of virtual environment (interpreter and structure as expected from a venv) usable with IDEs like PyCharm?

[kamadorueda]

@mschneiderwng thanks for the suggestion

Now the out output contains the virtual environment, like this:

[nix-shell:/data/python]$ nix build github:on-nix/python#pytest-latest-python39-out

[nix-shell:/data/python]$ tree -L 4 result
result
├── bin
│   ├── py.test -> /nix/store/ksnk8d5rj6cc8awji39nx64llzx5n4ix-pytest-latest-python39-out/bin/py.test
│   ├── pytest -> /nix/store/ksnk8d5rj6cc8awji39nx64llzx5n4ix-pytest-latest-python39-out/bin/pytest
│   ├── python -> /nix/store/aabk6mghmkzfnvlmlx4f2s6h1280gnmi-pytest-latest-python39-out-python/bin/python
│   ├── python3.9 -> /nix/store/aabk6mghmkzfnvlmlx4f2s6h1280gnmi-pytest-latest-python39-out-python/bin/python3.9
│   └── python3.9-config -> /nix/store/aabk6mghmkzfnvlmlx4f2s6h1280gnmi-pytest-latest-python39-out-python/bin/python3.9-config
└── lib
    └── python3.9
        └── site-packages
            ├── atomicwrites
            ├── atomicwrites-1.4.0.dist-info
            ├── attr
            ├── attrs-21.2.0.dist-info
            ├── colorama
            ├── colorama-0.4.4.dist-info
            ├── iniconfig
            ├── iniconfig-1.1.1.dist-info
            ├── packaging
            ├── packaging-21.0.dist-info
            ├── pluggy
            ├── pluggy-1.0.0.dist-info
            ├── py
            ├── py-1.10.0.dist-info
            ├── pyparsing-2.4.7.dist-info
            ├── pyparsing.py -> /nix/store/vs5dwbmni40z91kiz4pynp86jw01q87v-pyparsing-2.4.7-python39-out/lib/python3.9/site-packages/pyparsing.py
            ├── _pytest
            ├── pytest
            ├── pytest-6.2.5.dist-info
            ├── toml
            └── toml-0.10.2.dist-info

24 directories, 6 files

can you help me confirm if it works as you expected?