Stop embedded Python prompt from C++

Question

I'm running Python embedded in a C++ application. The program consists of a Qt GUI and a work QThread where computations happen. The user can chose to run a Python script from a file or to start a Python prompt. Both run in the QThread. The program exits when the python script is done or when we exit the python prompt. However, I want to handle the case when the user requests to quit from the GUI.

If running a Python script I can achieve this by a call to PyErr_SetInterrupt(see Stopping embedded Python). The Python interpreter stops, and we can quit normally. However, I haven't found a good way to force the Python prompt to quit.

I've tried feeding characters to stdin (with ungetc) in the hopes that the Python prompt receives them but without success. I do this from an overloaded PyOS_InputHook that I use to catch Qt events while the Python prompt is running.

Any ideas how to properly force the Python prompt to exit?

fish2000 · Accepted Answer · 2016-09-22 00:49:28Z

1

Can you not set up a slot receiver on your QThread subclass that will call PyErr_SetInterrupt in the proper context for you?

You might achieve cleaner separation-of-concerns if, instead of using QThreads, you run your embedded Python interpreter in a separate process – which you can then kill it as you see fit, or at least you can if you’re on a POSIX-y platform; I take it this type of operation is way different on e.g. Windows.

answered Sep 22, 2016 at 0:49

fish2000

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1 Comment

Jose Over a year ago

The problem is that PyErr_SetInterrput does not terminate the Python prompt. Separating the python process into a different thread may be a solution but it also adds more complexity that I was trying to avoid. It may be the way to go though.

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