Terry J. Reedy <tjre...@udel.edu> added the comment:

This is not really an IDLE issue; I only tagged it as such to make it easy for 
IDLE users to find.  It might or not be a python-install Catalina-upgrade 
issue.  It definitely is an Apple issue in that they care little for Python, 
nothing for tcl/tk, and released something that broke even 64-bit apps.

On my copy of Mohave, if x.py is open in IDLE, double clicking x.py in Finder 
does not open x.py in a new window.  Rather, it raises the existing x.py window 
to the top and makes it the active window.  This is what it should do.

IDLE File=>Open has a shortcut -- Command-O.  Either opens a  IDLE-specific 
Finder-like window.  The main difference from the Finder-app window is that 
selections are guaranteed to open in IDLE regardless of Finder/system settings. 
And once you have a file open, File-open/Command-C opens the IDLE-Finder dialog 
in the directory containing that file, with that file highlighted and others 
listed. So I consider this superior to the OS File Manager.  I also make great 
use of File=>Recent Files to open files.

Irv, file closing when you open another is a different issue from files not 
opening (but I don't know that a separate tracker issue would be useful).  It 
seems crazy, and was not reported by anyone else yet, but I will believe it 
without a movie.  Does this happen with IDLE's open dialog, or only with Finder 
itself?  If the latter, use the former.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38946>
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