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Remove setting of the eventloop function in the InProcessKernel #781

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merged 1 commit into from Oct 7, 2021

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rayosborn
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@rayosborn rayosborn commented Oct 6, 2021

The enable_gui function of the InProcessInteractiveShell calls a function of the same name in 'eventloops.py', which sets kernel.eventloop to a function defined by the requested GUI. For the InProcessKernel, kernel.eventloop should always be set to None. Otherwise, commands typed in the shell trigger a call to the parent kernel class's enter_eventloop function, which causes an exception because attributes like io_loop and msg_queue are not defined by the InProcessKernel.

This PR removes the call to the enable_gui function in 'eventloops.py' since the Qt event loop should already be running in the InProcessKernel.

This is designed to fix #780 and is possibly related to #775 and #319.

If the InProcessInteractiveShell version of `enable_gui` calls the parent function in eventloops.py, it initializes `kernel.eventloop`, whereas it should be `None` in the InProcessKernel. This triggers exceptions in the kernel's `entering_eventloop` function.
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Looks good to me, thanks @rayosborn!

@blink1073 blink1073 added the bug label Oct 7, 2021
@blink1073 blink1073 added this to the 6.4 milestone Oct 7, 2021
@blink1073 blink1073 merged commit d6e890d into ipython:master Oct 7, 2021
@rayosborn rayosborn deleted the fix-inprocess-enable-gui branch October 7, 2021 13:59
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Kernel eventloop function incorrectly initialized by the InProcessInteractiveShell
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