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From: Barry Scott <barry@barrys-emacs.org>
Newsgroups: comp.lang.python
Subject: Re: Crash when launching python
Date: Wed, 4 Sep 2024 20:48:21 +0100
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> On 4 Sep 2024, at 16:27, Guenther Sohler via Python-list =
<python-list@python.org> wrote:
>=20
> Is it possible to turn on debugging and  to display on the console, =
where
> python is loading files from ?
>=20

I assume you have a .app that is then packaged into a .dmg.

It will be the .app that you need to either build with a debug version =
of your code
or after building the .app edit the debug code into it.

Do you know that .app files are a tree of files?
You can right-click on an .app in Finder and it will have a "Show =
Package Context" option.

Or using the terminal and you can:
    cd <appname>.app/Contents

then have a look around.

Beware that you cannot use print to stdout for a .app as its =
stdin/stdout do not go anywhere useful.
What I do is use code like this in the main function:

sys.stdout =3D open( '/home/barry/debug.log', 'w', 1 )
sys.stderr =3D sys.stdout=20

Now you can use print(); look in the debug.log to see what happened.
Also any tracebacks will end up in the debug.log.

Barry