Custom Exceptions

Define and raise custom exception classes in an OOP style.

IntermediateTopic: Object-Oriented Programs
Back

Python Custom Exceptions Program

This program helps you to learn the fundamental structure and syntax of Python programming.

Try This Code
# Program to define and use a custom exception

class NegativeAgeError(Exception):
    pass


def set_age(age):
    if age < 0:
        raise NegativeAgeError("Age cannot be negative")
    print("Age set to", age)


set_age(20)
# set_age(-5)  # would raise NegativeAgeError
Output
Age set to 20

Understanding Custom Exceptions

Custom exceptions derive from Exception and add semantic meaning to error conditions.

Note: To write and run Python programs, you need to set up the local environment on your computer. Refer to the complete article Setting up Python Development Environment. If you do not want to set up the local environment on your computer, you can also use online IDE to write and run your Python programs.

Next
Class Decorator
Previous
Object Cloning
Next
Class Decorator

Table of Contents