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The error occurs when a user manually tries to stop a running program using Ctrl+ Cor Ctrl+ , or in the case of Jupyter Notebook by interrupting the kernel . To prevent accidental use of , which often occurs , we can use exception handling in Python.ZKeyboardInterruptKeyboardInterrupt

In this guide, you will learn how to catch errors in Python KeyboardInterrupt.

Catch errors try...exceptin Python using the statementKeyboardInterrupt

try...exceptThe statement is used for exception handling purposes in Python. try...exceptThe statement has a unique syntax; it is divided into three blocks, all of which have different purposes and functions in the Python code.

• tryBlocks contain groups of code that the interpreter must check for any errors.
• exceptBlock is used to add required exceptions and bypass code errors.
• finallyThe block contains statements that need to be executed without checking and are ignored by the tryand blocks.except

To illustrate KeyboardInterruptthe code in Python, we take a simple program that KeyboardInterruptasks for user input while manually handling exceptions.

The following code uses the statement to catch errors try...exceptin Python .KeyboardInterrupt

try:
    x = input()
    print("Try using KeyboardInterrupt")
except KeyboardInterrupt:
    print("KeyboardInterrupt exception is caught")
else:
    print("No exceptions are caught")

The above program gives the following output.

KeyboardInterrupt exception is caught

In the code above, the input function is placed trybetween blocks and left empty as no further details are needed in this case. exceptThe blocks then handle KeyboardInterrupterrors. KeyboardInterruptErrors are raised manually so that we can identify when KeyboardInterrupta process has occurred.

Python allows you to define as many blocks as you want in one piece of code except.

KeyboardInterruptErrors caught using signal handlers in Python

signalThe signal handler module is used to provide functions and mechanisms to use signal handlers in Python. We can catch SIGINTthe signal, which is basically an interrupt from keyboard Ctrl+ C. When this occurs, raising KeyboardInterruptis the default action.

Modules in Python sysare used to provide several necessary variables and functions for manipulating different parts of the Python runtime environment.

signalThe and sysmodules need to be imported into your Python code to successfully use this method without any errors.

KeyboardInterruptThe following code uses a signal handler to catch errors in Python .

import signal
import sys


def sigint_handler(signal, frame):
    print("KeyboardInterrupt is caught")
    sys.exit(0)


signal.signal(signal.SIGINT, sigint_handler)

The above code gives the following output.

KeyboardInterrupt is caught

In the code above, signal.signal()functions are used to define custom handlers to be executed when a certain type of signal is received.

We should note that once a handler is set for a particular signal, it remains installed until the user manually resets it. The only exception in this case is SIGCHLDthe handler for .