Web Reference: Jul 23, 2025 · To define a custom exception in Python, you need to create a new class that inherits from the built-in Exception class or one of its subclasses. Here’s a basic example: How do I declare custom exception classes in modern Python? My primary goal is to follow whatever standard other exception classes have, so that (for instance) any extra string I include in the exception is printed out by whatever tool caught the exception. In this tutorial, we will learn how to define custom exceptions depending upon our requirements with the help of examples.
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