Python interpreter is not the same in JupyterLab - Notebook vs Terminal

in notebook:

import pandas 
import sys
print(sys.executable)

(pandas import works)

---

in terminal

python -c "import pandas" # fails
ls -lah $(which python)

---

let
  mach-nix = import (builtins.fetchGit {
    url = "https://github.com/DavHau/mach-nix/";
    ref = "refs/heads/master";
    #rev = "1bc3bee2d0eb3acaa4af106d242b8c4bd7ec66a4";
  });

  nixpkgs = import mach-nix.nixpkgs.path {config= { allowUnfree = true; };  };
  py = nixpkgs.python37Packages ;

  py_env = mach-nix.mkPython rec {
    pkgs = nixpkgs;
    python = nixpkgs.python37;
    requirements =  ''  
    ipython
    jupyterlab
    pandas
      '';

    providers = {

    };
  };
in 
nixpkgs.mkShell rec {
  buildInputs = [
    nixpkgs.bash
    nixpkgs.nix-tree

    ( (py_env).override( args:{ignoreCollisions=true; })  )
  ] ;

  shellHook = ''
        # # # install data/pretrained pipes from spark-nlp
        python -c "import pandas"

        jupyter lab 
        '';
}

[InLaw]

on the NixOS system there is no JupyterLab installed

• only in nix-shells

[rokroskar]

are you sure the kernel you are using in the notebook is the nix-installed one and some other one found on your system?