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

This is a well-known bug with older versions of Tk on macOS.  Chances are that 
the Python 3.6.3 you are using is using the Apple-supplied version of Tk 8.5.x 
which exhibits this bug.  If you are using Python 3.6.3 downloaded from 
python.org, as documented in the installer readme and release notice, be aware 
that it links with Tk 8.5, not 8.6, so you will need to install a more recent 
version of ActiveTcl 8.5.  More details here: 
https://www.python.org/download/mac/tcltk/

----------
nosy: +ned.deily
resolution:  -> third party
stage:  -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32481>
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