Keyboard interrupt not working on my program

Question

I'm making a program on python 2.7 with tkinter. This is a simple tkinter GUI with just 1 button, and that button executes a function.

#Code for the tkinter

#function that the button calls
x=0
def check_entry():
    While True:
        try:
            if(x==1):
                #do something
        except KeyboardInterrupt:
            break

This is a example, in reality I'm working with a raspberry pi and what I'm checking (instead of "x") is a GPIO.input.

The problem is that KeyboardInterrupt doesn't work every time. While doing like 30 tests with the code, KeyboardInterrupt worked 2 times (after pressing CTRL-C almost 20 times).

PS1: I'm working en Raspbian.
PS2: I read that maybe the problem is with the interpreter, so I executed the program like an .exe (with chmod +x) and that didn't work.
PS3: I think the problem is that the "Try:" function executes itself many times per second, so the program doesn't catch the pressing of CTRL-C?

What are you trying to achieve with this function? Why do you need an infinite loop that you break out of? — JohanL
– JohanL, Commented Sep 14, 2017 at 15:29
"doesn't work every time" is unclear, so we can't help you from here. What do you expect? What actually happens when it "doesn't work"? — Thierry Lathuille
– Thierry Lathuille, Commented Sep 14, 2017 at 15:29
JohanL: I'm trying to check for an entry with 3 modes. mode 1 is going to be an infinite loop (this one), mode 2 is going to be a entry check for 1 day, and mode 3 is going to check for the entry depending on what the user enters. — DJ007
– DJ007, Commented Sep 14, 2017 at 15:33
Thierry: With "doesn't work every time" I mean that the program keep executing, and only 2 times I was able to close the program. — DJ007
– DJ007, Commented Sep 14, 2017 at 15:34
It's hard to answer this without seeing a minimal reproducible example. Since it's a very bad practice to have an infinite loop inside of the GUI thread of a tkinter program, there's just no way to give an answer that includes that loop. We can't offer alternatives without knowing more about what you're trying to do with that loop, or why you need to check for a KeyboardInterupt In a GUI program. — Bryan Oakley
– Bryan Oakley, Commented Sep 14, 2017 at 22:15

Roman Mindlin · Accepted Answer · 2017-09-19 10:18:00Z

1

You cannot catch KeyboardInterrupt in Tcl/Tk main loop, it may be handled only by Python interpreter itself. You should use another way to interrupt you program.

Check this answer for additional info.

answered Sep 19, 2017 at 10:18

Roman Mindlin

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