How to Break a Function in Python?

Last Updated : 16 Dec, 2024

In Python, breaking a function allows us to exit from loops within the function. With the help of the return statement and the break keyword, we can control the flow of the loop.

Using return keyword

This statement immediately terminates a function and optionally returns a value. Once return is executed, any code after it is ignored and the function exits at that point.

Example:

Python

def fun(a): if a < 18: return "Underage" # Terminate return "Eligible" # Continue print(fun(15))

Output

Underage

Explanation:

This function checks if the input a is less than 18. If true, it returns "Underage" and terminates the function.
As a is 18 or more, it returns "Eligible", indicating the function continues normally.

Common Methods to break a Function

In Python, we use the "break" and "return" statements to exit a function. However, there are other ways to manage flow control or exit from a function, depending on the situation.

Let's explore these methods in detail, one by one.

Table of Content

Using break keyword

break statement exits a loop early but allows the function to continue after the loop. It is generally used in for and while loops.

Example:

Python

def fun(no):     for i in no:         if i % 2 == 0:             print(i)  # Found             break     else:         print("Not Found")  # Not found  # input fun([1, 3, 5, 8, 7])

Output

Explanation:

This function finds the first even number in the list, prints it and exits the loop.
If no even number is found, it prints "Not Found".

using raise keyword

raise statement exits the function by raising an exception, stopping the normal flow and passing the error.

Example:

Python

def fun(a, b):     if b == 0:         raise ValueError("Error")  # Error     return a / b  # Output  # Input try:     print(fun(10, 0))  # Will raise an exception except ValueError as e:     print(e)  # Error

Output

Error

Explanation:

This function raises a ValueError with the message "Error" if b is 0.
This try block calls the function and the except block prints the error message when caught.

using sys.exit()

sys.exit() function terminates the entire program, not just the function and is typically used to end a script under specific conditions.

Example:

Python

import sys def fun(a):     if a < 18:         print("Exiting")  # Exit         sys.exit()     return "Valid."  # Valid # Input fun(15)

Output

Exiting

Explanation:

This function exits the program if a is less than 18, printing "Exiting."
Otherwise, it returns "Valid.".

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