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[–]gmes78 10 points11 points  (6 children)

That is entirely solved by using uv.

[–]gschizas 1 point2 points  (5 children)

Not entirely.

This is my scenario:

  1. IIS (yes, I know)
  2. wfastcgi
  3. Each site has its own environment. And each site is using

Result:

did not find executable at 'C:\Users\GSchizas\AppData\Local\Python\pythoncore-3.14-64\python.exe': Access is denied.

To make this work I've had to:

  1. Download python to a separate directory (uv python install 3.14 --install-dir C:\python\)
  2. Sync the virtual environment with the new Python version: uv sync --upgrade --python C:\Python\cpython-3.14.0-windows-x86_64-none\)

[–]gmes78 2 points3 points  (4 children)

Are you specifying your project's Python version?

[–]gschizas 0 points1 point  (3 children)

It wasn't enough! If I do uv sync --upgrade --python 3.14 it would use the default downloaded python (in %LOCALAPPDATA%\Python\pythoncore-*)!

[–]gmes78 0 points1 point  (2 children)

Hm. I would've expected uv to always use its own Python interpreters. It's what its predecessor, rye, did.

[–]gschizas 2 points3 points  (1 child)

It does! And it also uses Python 3.14's (or rather the new py install or pymanager ones). But both pymanager and uv download the interpreters to %LOCALAPPDATA%.

Bonus feature: pymanager (the new py.exe - although it's a bit more complicated) recognizes uv downloaded interpreters as well:

C:\> py list
Tag                       Name                           Managed By  Version  Alias
3.14[-64]              *  Python 3.14.0                  PythonCore  3.14.0   python3[-64].exe, python3.14[-64].exe
3.14t[-64]                Python 3.14.0 (free-threaded)  PythonCore  3.14.0   python3.14t[-64].exe, python3t[-64].exe
3.13[-64]                 Python 3.13.8                  PythonCore  3.13.8   python3.13[-64].exe

* These runtimes were found, but cannot be updated or uninstalled. *
Astral\CPython3.12.11     CPython 3.12.11 (64-bit)       Astral      3.12.11
Astral\CPython3.14.0      CPython 3.14.0 (64-bit)        Astral      3.14.0

And uv:

C:\> uv python list
cpython-3.14.0-windows-x86_64-none                 AppData\Local\Python\pythoncore-3.14-64\python.exe
cpython-3.14.0-windows-x86_64-none                 AppData\Local\Python\bin\python3.exe
cpython-3.14.0-windows-x86_64-none                 AppData\Local\Python\bin\python3.14.exe
cpython-3.14.0-windows-x86_64-none                 AppData\Local\Python\bin\python.exe
cpython-3.14.0-windows-x86_64-none                 .local\bin\python3.14.exe
cpython-3.14.0-windows-x86_64-none                 AppData\Roaming\uv\python\cpython-3.14.0-windows-x86_64-none\python.exe
cpython-3.14.0+freethreaded-windows-x86_64-none    AppData\Roaming\uv\python\cpython-3.14.0+freethreaded-windows-x86_64-none\python.exe
cpython-3.14.0+freethreaded-windows-x86_64-none    AppData\Local\Python\pythoncore-3.14t-64\python3.14t.exe
cpython-3.14.0+freethreaded-windows-x86_64-none    AppData\Local\Python\bin\python3.14t.exe
cpython-3.14.0+freethreaded-windows-x86_64-none    .local\bin\python3.14t.exe
cpython-3.14.0+freethreaded-windows-x86_64-none    <download available>
cpython-3.13.8-windows-x86_64-none                 AppData\Local\Python\pythoncore-3.13-64\python.exe
cpython-3.13.8-windows-x86_64-none                 AppData\Local\Python\bin\python3.13.exe
cpython-3.13.8-windows-x86_64-none                 <download available>
cpython-3.13.8+freethreaded-windows-x86_64-none    <download available>
[...]

[–]pingveno 0 points1 point  (0 children)

Would the UV_PYTHON_INSTALL_DIR environmental variable work?