bug#58678: 28.2; :session in org-babel for python unexpected output

[Sergey via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Hey Eli!

Thank you for reaching out!
I have Emacs 29.1 installed on my Macbook with Spacemacs config. I am not sure what commit python.el is on in Spacemacs but the python code works with :session. 

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On Friday, May 3rd, 2024 at 3:35 AM, kobarity <kobarity@gmail.com> wrote:

> Eli Zaretskii wrote:
> 
> > > From: Ihor Radchenko yantar92@posteo.net
> > > Cc: 58678@debbugs.gnu.org
> > > Date: Thu, 02 May 2024 17:11:15 +0000
> > > 
> > > Ihor Radchenko yantar92@posteo.net writes:
> > > 
> > > > > I have traced this to org-bable issue with MacOS python readline and native completion. Similar issues discussed in
> > > > > https://github.com/jorgenschaefer/elpy/issues/887
> > > > > and
> > > > > https://debbugs.gnu.org/cgi/bugreport.cgi?bug=25753
> > > > > 
> > > > > The solution proposed in those threads, i.e., installing python from homebrew, which has gnureadline, helps for emacs 27 but causes freezing in emacs 28 after displaying following message:
> > > > > `Warning (python): Your ‘python-shell-interpreter’ doesn’t seem to support readline, yet ‘python-shell-completion-native-enable’ was t and "python3" is not part of the ‘python-shell-completion-native-disabled-interpreters’ list. Native completions have been disabled locally.`
> > > > > 
> > > > > Setting ~python-shell-completion-native-enable~ to nil removes the warning but doesn't prevent freezing. This behaviour persists with minimal org setup as well (although, I believe my emacs comes with org pre-packaged).
> > > > 
> > > > So, it looks like Emacs bug then.
> > > > Let us see what Emacs devs can suggest.
> > > 
> > > CCing Eli.
> > 
> > I have no idea what happens here, so I added kobarity in the hope that
> > he would know.
> 
> 
> As far as I have tried on my son's MacBook, this problem was
> reproduced with 29.3 but not with the latest python.el. It was fixed
> by the commit d5757178464ca51f79c7fc1ab199a1582e92ab32.
> 
> Sergey, could you try one of the following?
> 
> 1. With Emacs 29, apply the changes of python.el in the commit
> d5757178464ca51f79c7fc1ab199a1582e92ab32.
> 2. Build Emacs on master branch.