bug#54860: 28.1; Problem with run-python

[Eli Zaretskii]

> From: Robert Thorpe <rt@robertthorpeconsulting.com>
> Date: Mon, 11 Apr 2022 17:54:56 +0100
> 
> 
> I recently upgraded to Emacs 28.1 on Microsoft Windows.  I'm having
> problems with Inferior Python mode.  On Emacs 27.2 that mode works.
> However, it doesn't work on Emacs 28.1, not even from emacs -Q.
> 
> Reproduction is easy, from emacs -Q do "M-x run-python" on a Windows 10
> machine.
> 
> The variable exec-path contains the path to the python interpreter
> ("C:/Program Files/Python39/").  Emacs is correctly picking up the
> components of exec-path from my PATH environmental variable.
> 
> However, run-python gives the error:
> "Python was not found; run with arguments to install from the Microsoft
> Store, or disable this shortcut from Setting > Manage App Execution
> Aliases.
> 
> Process Python exited abnormally with code 49"

I cannot reproduce this here.  Could it be that the spaces in
"Program Files" are somehow the culprit?  (On my system Python is
installed in a directory without embedded blanks.)

If nothing gives a clue, can you step with Edebug through run-python
and its subroutines, and see what command is invoked by Emacs and how
it fails?

Thanks.