Ned Deily <n...@python.org> added the comment:

If Homebrew links against the Apple-supplied Tcl and Tk frameworks, which are 
in /System/Library/Frameworks, all bets are off as those are deprecated and 
hopelessly out-of-date versions of Tcl/Tk 8.5. If tkinter is linked to Tcl and 
Tk frameworks in /Library/Frameworks and there are Tcl and Tk frameworks there, 
those are not supplied by Apple; they are either installed by Homebrew from 
somewhere else (ActiveTcl or perhaps built from source). It can be confusing 
trying to determine which instance of Tcl or Tk tkinter is actually using at 
runtime on macOS.  The command:

python3.9 -m test.pythoninfo

will display the patch level of Tk in use.  There is some more detail of how it 
all works here: https://www.python.org/download/mac/tcltk/

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue42480>
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