$PY_PYTHON is not being honoring on a brew installed py on macOS

[Christian Clauss]

For the solution, please see #235 (comment)

Describe the bug
A clear and concise description of what the bug is.

I would like to configure py to use Python 3.11 as its default on my Mac...

To Reproduce
Steps to reproduce the behavior:

1. brew install python-launcher python@3.9 python@3.10 python@3.11
2. py --list

   3.11 │ /opt/homebrew/bin/python3.11
   3.10 │ /opt/homebrew/bin/python3.10
   3.9 │ /opt/homebrew/bin/python3.9

3. py --version

   Python 3.9.15 # :-(

4. export PY_PYTHON=3.11
5. echo $PY_PYTHON

   3.11

6. py --version

   Python 3.9.15 # :-(

Expected behavior
A clear and concise description of what you expected to happen.

1. py --version

   Python 3.11.0

Screenshots
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System Details (please complete the following information):

• OS: macOS
• Shell: zsh
• Launcher Version: Python Launcher for Unix 1.0.0

Additional context
Add any other context about the problem here.

[Christian Clauss]

SOLVED: The PYLAUNCH_DEBUG=1 trick from #108 helped me to understand that a parent directory had a venv that py was picking up. Once I updated that venv, python-launcher behaved as expected.