### Bug description

Currently, using Python and Quarto supposes that `py.exe` is used. 
First Python is check on windows with py launcher if `PY_PYTHON` is set
https://github.com/quarto-dev/quarto-cli/blob/e13e08c7e0036f42b6e3e1f77ad16ef1d4d20ff5/src/core/jupyter/capabilities.ts#L34-L37

But also a second time if conda not found
https://github.com/quarto-dev/quarto-cli/blob/e13e08c7e0036f42b6e3e1f77ad16ef1d4d20ff5/src/core/jupyter/capabilities.ts#L44-L51

Using `pyenv` on windows (https://pyenv-win.github.io/pyenv-win/) will not register python version in registry so `py.exe` will not found it. 

Here is my setup 
````powershell
> py --list
Installed Pythons found by C:\Windows\py.exe Launcher for Windows
No Installed Pythons Found!

> pyenv versions
* 3.9.13 (set by C:\Users\chris\scoop\apps\pyenv\current\pyenv-win\version)

> quarto check jupyter

[>] Checking Python 3 installation....(None)

      Unable to locate an installed version of Python 3.
      Install Python 3 from https://www.python.org/downloads/

> (Get-Command python3).Path
C:\Users\chris\scoop\apps\pyenv\current\pyenv-win\shims\python3.bat

> python3 C:\Users\chris\Documents\DEV_R\quarto-cli\src\resources\capabilities\jupyter.py
versionMajor: 3
versionMinor: 9
versionPatch: 13
versionStr: "3.9.13 (tags/v3.9.13:6de2ca5, May 17 2022, 16:36:42) [MSC v.1929 64 bit (AMD64)]"
conda: false
execPrefix: "C:/Users/chris/scoop/apps/pyenv/current/pyenv-win/versions/3.9.13"
executable: "C:/Users/chris/scoop/apps/pyenv/current/pyenv-win/versions/3.9.13/python3.exe"
jupyter_core: 4.11.1
nbformat: 5.4.0
nbclient: 0.6.6
ipykernel: 6.15.1
````

So for now `quarto` does not find Python because `py.exe` does not find it. 

Current workaround is to set `QUARTO_PYTHON`
```powershell
$env:QUARTO_PYTHON=$(pyenv which python3)
```
Then 
````powershell
> quarto check jupyter

[>] Checking Python 3 installation....OK
      Version: 3.9.13
      Path: C:/Users/chris/scoop/apps/pyenv/current/pyenv-win/versions/3.9.13/python3.exe
      Jupyter: 4.11.1
      Kernels: bash, julia-1.7, python3

[>] Checking Jupyter engine render....OK
````

I think it would be helpful to bring better support to pyenv for windows inside Quarto. 

As a side note, this below does not found `python` binary on windows even if in PATH
https://github.com/quarto-dev/quarto-cli/blob/e13e08c7e0036f42b6e3e1f77ad16ef1d4d20ff5/src/core/jupyter/capabilities.ts#L41-L42

because of Deno limitation on Windows (same as tinytex fixes) and `requireQuoting()` with `safeWindowsExec()` is required to make it work. 

This would however prevent finding `python3` which is looked after. 

Anyway, I think there is some improvement to do here for Windows user experience.
cderv
2022-07-20T09:29:53Z
cderv
enhancement windows python-setup
Future
open
Support other python on Windows than py.exe supported ones (like pyenv)
https://github.com/quarto-dev/quarto-cli/issues/1463