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

> It seems to be compiled using Tcl 8.5 that is installed with the system.

Yes, and that is almost certainly the original poster's problem, as well.  In 
fact, this same issue was reported in Issue10731 in 2010. The Tcl/Tk 8.5 
supplied by Apple in macOS is terribly out-of-date and dangerously buggy; it 
should never be used.  You should even be seeing a warning message from IDLE 
when using that system Tcl/Tk. I'm not familiar with how Homebrew manages the 
Tcl/Tk that their Pythons link with but, if necessary, you should follow up 
with them to ensure that none of their recipes use the system Tcl/Tk.

More details here:
https://www.python.org/download/mac/tcltk/

----------
resolution:  -> duplicate
stage:  -> resolved
status: open -> closed
superseder:  -> UnicodeDecodeError in OS X tkinter when binding to <MouseWheel>

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37391>
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