Web Reference: Feb 12, 2026 · User-defined exceptions are created by defining a new class that inherits from Python's built-in Exception class or one of its subclasses. By doing this, we can create custom error messages and handle specific errors in a way that makes sense for our application. User-defined exceptions in Python are custom error classes that you create to handle specific error conditions in your code. They are derived from the built-in Exception class or any of its sub classes. In Python, we can define custom exceptions by creating a new class that is derived from the built-in Exceptionclass. Here's the syntax to define custom exceptions, Here, CustomError is a user-defined error which inherits from the Exceptionclass.
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