Bug: uv venv on windows cannot find python from pyenv #1660
Description
(latest windows 11)
$ pyenv version
* 3.10.8 (set by C:\Users\warch\.pyenv\pyenv-win\version)
$ python --version
Python 3.10.8
$ pipx install uv
$ uv --version
uv 0.1.4On Windows I use pyenv to manage python versions. Currently 3.10.8 is installed. And I never installed python via downloadable installer.
On clean windows py and python point to a shim that Windows created at C:\Users\warch\AppData\Local\Microsoft\WindowsApps\python.exe - that thing is not a real python - if you run python or py Windows opens Microsoft Store, and will propose to install python from the Store.
Bug description:
$ uv venv venv2
x failed to canonicalize path `C:\Users\warch\AppData\Local\Microsoft\WindowsApps\python.exe`
`-> The file cannot be accessed by the system. (os error 1920)
$ rm C:\Users\warch\AppData\Local\Microsoft\WindowsApps\python.exe
$ uv venv venv2
x Failed to run `py --list-paths` to find Python installations. Is Python installed?
`-> program not found
$ py
py : The term 'py' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a
path was included, verify that the path is correct and try again.
At line:1 char:1
+ py
+ ~~
+ CategoryInfo : ObjectNotFound: (py:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException
$ uv venv venv2 -p python
x Querying Python at `C:\Users\warch\.pyenv\pyenv-win\shims\python.bat` failed with status exit code: 1:
| --- stdout:
| --- stderr:
| File "<string>", line 1
| import json || goto :error
| ^
| SyntaxError: invalid syntax
| ---
On Windows uv venv uses py --list-versions to get python, and I think uv could do more checks to ensure py exists, to check if pyenv is installed, etc:
(very rough python implementation of possible checks):
def get_python_path_windows():
# try to use `py` to find `python`
py = shutil.which("py")
if py and check_if_valid_win32_app(py):
return get_python_from_py(py)
# maybe `python` exists in PATH?
python = shutil.which("python")
if python and check_if_valid_win32_app(python):
# check_if_valid_win32_app would return False on `python.bat` created by pyenv
return python
# check if pyenv is installed
pyenv = shutil.which("pyenv")
if pyenv:
return get_python_from_pyenv(pyenv)
return None
def get_python_from_pyenv(pyenv):
# pyenv which python returns path to python.exe
return subprocess.check_output([pyenv, "which", "python"]).strip().decode("utf-8")