user defined exception in python w3schools

Certainly! Here's an informative tutorial on user-defined exceptions in Python, following a style similar to W3Schools, along with a code example:
In Python, exceptions are a powerful mechanism to handle errors during the execution of a program. While Python provides a wide range of built-in exceptions, there might be situations where you need to define your own custom exception to handle specific error cases. This tutorial will guide you through the process of creating and using user-defined exceptions in Python.
A user-defined exception is an exception that you create based on your specific requirements. By defining your own exceptions, you can make your code more readable, maintainable, and tailor error handling to the needs of your application.
To create a user-defined exception, you need to define a new class that inherits from the built-in Exception class. Let's create a simple example:
Now that we have our custom exception, let's see how to use it in our code:
In this example, the example_function checks if the input value is negative. If it is, it raises our custom exception with a specific error message. In the try block, we call the function and handle our custom exception. If a ValueError occurs (e.g., if the user enters a non-numeric value), we catch it separately.
Creating and using user-defined exceptions in Python allows you to enhance the clarity and robustness of your code. By tailoring exception classes to your application's needs, you can handle errors in a way that makes sense for your specific use case.
Remember, while it's powerful to create custom exceptions, it's essential to strike a balance and use them judiciously where needed.
Happy coding!
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