0Pricing
Python Academy · Lesson

Custom Exception Classes

Define your own exception types for clearer error communication.

Introduction

Custom exception classes make your error handling explicit, self-documenting, and easy for callers to handle precisely.

Why Custom Exceptions?

Built-in exceptions are too generic. Custom ones let callers catch only YOUR library's errors without catching unrelated ones.
class AppError(Exception):
    pass
raise AppError('something went wrong')

All lessons in this course

  1. Understanding Exceptions
  2. try / except / else / finally
  3. Raising and Re-raising Exceptions
  4. Custom Exception Classes
← Back to Python Academy