Python 3 KeyboardInterrupt error

Question

I have noticed that on any python 3 program no matter how basic it is if you press CTRL c it will crash the program for example:

test=input("Say hello")
if test=="hello":
    print("Hello!")
else:
    print("I don't know what to reply I am a basic program without meaning :(")

If you press CTRL c the error will be KeyboardInterrupt is there anyway of stopping this from crashing the program?

The reason I want to do this is because I like to make my programs error proof, and whenever I want to paste something into the input and I accidentally press CTRL c I have to go through my program again..Which is just very annoying.

That's the whole point of Ctrl + C. It's a hotkey to exit out of whatever program you're running. — Morgan Thrapp
– Morgan Thrapp, Commented Jun 17, 2016 at 18:00
Not just Python, anything you run in the command line. It's been that way since early UNIX systems. — Morgan Thrapp
– Morgan Thrapp, Commented Jun 17, 2016 at 18:02
Oh im new to coding im only 14 don't even know what UNIX systems are but I guess that makes sense — E_J
– E_J, Commented Jun 17, 2016 at 18:04

Tadhg McDonald-Jensen · Accepted Answer · 2023-06-18 20:26:23Z

22

Control-C will raise a KeyboardInterrupt no matter how much you don't want it to. However, you can pretty easily handle the error, for example, if you wanted to require the user to hit control-c twice in order to quit while getting input you could do something like:

def user_input(prompt):
    try:
        return input(prompt)
    except KeyboardInterrupt:
        print("press control-c again to quit")
    return input(prompt) #let it raise if it happens again

Or to force the user to enter something no matter how many times they use Control-C you could do something like:

def upset_users_while_getting_input(prompt):
    while True: # broken by return
        try:
            return input(prompt)
        except KeyboardInterrupt:
            print("you are not allowed to quit right now")

Although I would not recommend the second since someone who uses the shortcut would quickly get annoyed at your program.

edited Jun 18, 2023 at 20:26

answered Jun 17, 2016 at 20:14

Tadhg McDonald-Jensen

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2 Comments

MartyIX Over a year ago

Gratz to 10k :-)

Tadhg McDonald-Jensen Over a year ago

As a side note, if you have a Mac copy is command-c and KeyboardInterupt is control-c so I never get this issue when copying stuff. ;P

Zishen Luo · Accepted Answer · 2021-08-27 12:12:20Z

-1

Also, in your program, if someone inputs "Hello", it would not reply hello back as the first letter is capital, so you can use:

if test.isupper == True:
  print("Hello!")

answered Aug 27, 2021 at 12:12

Zishen Luo

19

2 Comments

Community Over a year ago

Please provide additional details in your answer. As it's currently written, it's hard to understand your solution.

Tadhg McDonald-Jensen Dec 16, 2024 at 22:19

"Hello".isupper is a method, it will never be equal to True. It is unclear how this attempts to answer the question and further unclear what you expect the sample code to accomplish.

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