Terry J. Reedy added the comment:

Scratch my confusion.  I added "print('after')" immediately after 
_thread.interrupt_main() in idlelib.run.Executor.interrupt_the_server() and 
'after' is printed in Shell right after I hit ^C but a time.sleep(10) is not 
immediately interrupted and 'KeyboardInterrupt' does not show for nearly 10 
seconds.  I don't know if this is a bug or unavoidable limitation not mentioned 
in the _thread doc.  I might be system dependent.
https://docs.python.org/3/library/_thread.html#_thread.interrupt_main

----------
assignee: terry.reedy -> 
components: +Library (Lib) -IDLE
title: time.sleep ignores keyboard interrupt in IDLE -> time.sleep ignores 
_thread.interrupt_main()
versions:  -Python 3.6, Python 3.7

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<http://bugs.python.org/issue29926>
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