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Cannot create venv using Python 3.12 #133
Description
I can't seem to create virtual environments using Python 3.12 via pymanager as the files venvwlauncher.exe and venvlauncher.exe seems to be missing.
Steps to reproduce the behavior:
- Install Python 3.12 via pymanager:
py install 3.12 - Create virtual environment with Python 3.12:
py -3.12 -m venv .venv
The following error is given:
Unable to copy 'C:\\Users\\<user>\\AppData\\Local\\Python\\pythoncore-3.12-64\\venvwlauncher.exe'
Unable to copy 'C:\\Users\\<user>\\AppData\\Local\\Python\\pythoncore-3.12-64\\venvlauncher.exe'
Error: [WinError 2] The system cannot find the file specified
Activity
zooba commentedon Jun 13, 2025
Thank you for finding this! I can't believe it slipped through, I know I tested it at various times.
It looks like when free-threading support was added, the venv scripts were no longer renamed from
venvlaunchertopythonduring build, but for repackaging older versions the new script was used.I'll need to repackage those releases, which is a bit annoying, but unavoidable it seems. In the meantime, this Powershell command will fix up any installs:
zooba commentedon Jun 13, 2025
Oh, and in case anyone notices that the error message refers to the prefix directory instead of
Lib\venv\scripts\nt, it's because the first failure is swallowed and the second attempt (assuming it's a source tree) is reported. Once we find the file in the right place, the case that's being reported isn't even checked.zooba commentedon Jun 13, 2025
Thanks for the report. I'm going through and republishing the 3.11 and 3.12 packages right now, so an alternative fix will (soon) be to
py install 3.12 --forceto replace your existing install. The Powershell command above will be faster, though.