Nov 5, 2013 · While the previous answers are helpful, they don't always work in all situations. If you have a Python-CV window open, which is waiting for a key press to quit, while running from inside vim, as a (weirdly specific) example, and you accidentally close the window normally, it will continue to run and Ctrl+C and Ctrl+Z might simply print to the terminal and get ignored.

Sep 16, 2008 · (Note: using exceptions for exits is a python practical work-around for C/C++/Java devs always inappropriately calling exit-- hence python programmers may not notice the stench of this code smell as much); and lastly, (3) multi-threaded code (which pythonistas have historically just …

The Python library reference explicitly states that those functions should only be used in the interactive interpreter and not in programs. – alldayremix Commented Feb 23, 2013 at 19:54

@kramer65: A program exit code of 0 means "finished without errors". Since the sys.exit call appears to be caused by an error, it should yield a program exit code that is not 0. 1 is just a suggestion. –

Oct 23, 2012 · So Python is saying there's something wrong after the if statement. If you look at the other if statements, you'll notice that this one is missing the : at the end, so change it to: if choice == 'q': So with that change the program runs, and seems to …

It turns out that as of Python 3.6, the Python interpreter handles Ctrl + C differently for Linux and Windows. For Linux, Ctrl + C would work mostly as expected. However, on Windows, Ctrl + C mostly doesn't work, especially if Python is running a blocking call, such as thread.join or waiting on a web response.

Jul 1, 2015 · I have a python script that uses plt.show() as it's last instruction. When it runs, IDLE just hangs after the last instruction. I get the image but I don't get the prompt back. On other scripts I typically use ctrl-c to break the program (sometimes doesn't work immediately) but how do I get the prompt back with the plt.show()? Ctrl-c doesn't ...

Jul 16, 2018 · import os os.exit("The radius is negative"), the value inside the exit() function will be printed to stderr and the return code will be 1 (thanks to @peter-wood for that revelation) and just before that you can just use print for the message

Nov 1, 2012 · Didn't work in python 3, according to python 3 docs: "Threads interact strangely with interrupts: the KeyboardInterrupt exception will be received by an arbitrary thread. (When the signal module is available, interrupts always go to the main thread.)"

Mar 29, 2018 · I have a program that is an endless loop that prints "program running" every 5 seconds and I want to stop it when I press the end key. So I created a key listener that returns false if the end key is pressed. That should work if I won't have the endless loop. And I want it to work even when I'm in the endless loop. Here's my code: