Terry J. Reedy <tjre...@udel.edu> added the comment:
I changes the import to theading instead of thread and the start line to
threading.Thread(target=example)
On 3.7 with tcl/tk 8.6 with thread support, I see the gui when mainloop is
called in the thread, and then the >>> prompt appears. On 2.7 with tk 8.5
without thread support, I see no hang but only >>>, no box, after the same time
delay.
With thread support, thread calls work. Without, success varies, and so do
failure modes. See #33479 for proposed doc on tkinter and thread safety.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue6933>
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