Libraries from the local folder are not imported

Describe the bug With the latest version (0.16.0.0) the libraries from the local folder __pypackages__ are not imported.

How to reproduce

python3 -m pip install --user pythonloc python3 -m pipx ensurepath piploc install flask pipx run --pypackages flask

Traceback

Traceback (most recent call last):
  File "/home/martin/workspace/flask-desktop/__pypackages__/3.8/lib/bin/flask", line 5, in <module>
    from flask.cli import main
ModuleNotFoundError: No module named 'flask'

Expected behavior

It should show the following:

Usage: flask [OPTIONS] COMMAND [ARGS]...

  A general utility script for Flask applications.

  Provides commands from Flask, extensions, and the application. Loads the
  application defined in the FLASK_APP environment variable, or from a
  wsgi.py file. Setting the FLASK_ENV environment variable to 'development'
  will enable debug mode.

    $ export FLASK_APP=hello.py
    $ export FLASK_ENV=development
    $ flask run

Options:
  --version  Show the flask version
  --help     Show this message and exit.

Commands:
  db      Perform database migrations.
  lint    Lint and check code style with 'flake8' and 'isort' recursively.
  ps      Perform postgres operations.
  roles   Role commands.
  routes  Show the routes for the app.
  run     Run a development server.
  shell   Run a shell in the app context.
  users   User commands.

[itsayellow]

Ohhh I see what’s happening. One part of our code run_pypackage_bin adds the __pypackages__ path to env variable PYTHONPATH, and then exec_app uses _fix_subprocess_env to remove PYTHONPATH before running the code.

Here is the helpful comment in the code:

    # Remove PYTHONPATH because some platforms (macOS with Homebrew) add pipx
    #   directories to it, and can make it appear to venvs as though pipx
    #   dependencies are in the venv path (#233)

Hmmm. Seems we have a fix in conflict with the operation of a feature. (See #233)

[mmozos]

@mmozos just a guess looking at the code: Have you changed python versions lately? Could pipx be running from a different python version than the flask you installed?

It looks like our code adds __pypackages_/<python_version>/lib to env variable PYTHON_PATH before running your flask app. pipx determines <python_version> by using its own python version. If that’s different than what you have for flask (3.8) then that might explain why it isn’t working.

EDIT: Hmm this may not explain anything. It looks like our code should use the same root path for both the console script binary and the libraries. So if it finds the console script I’m not sure why it isn’t adding the right path for the supporting packages.

I am using the only one and the default python version that comes in Linux Mint 20.04.