Web Reference: 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. 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: 1 day ago · Some have custom memory layouts which makes it impossible to create a subclass that inherits from multiple exception types. The memory layout of a type is an implementation detail and might change between Python versions, leading to new conflicts in the future.
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