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. When you use the raise statement in Python to raise (or throw) an exception, you signal an error or an unusual condition in your program. With raise, you can trigger both built-in and custom exceptions. You can also include custom messages for more clarity or even re-raise exceptions to add context or handle further processing. Jul 23, 2025 · In Python, exceptions occur during the execution of a program that disrupts the normal flow of the program’s instructions. When an error occurs, Python raises an exception, which can be caught and handled using try and except blocks.
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