python raise exception with status code
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Title: Python Tutorial: Raising Exceptions with Custom Status Codes
Introduction:
Exceptions in Python are a powerful mechanism for handling errors and exceptional situations in your code. While Python provides a variety of built-in exceptions, there are scenarios where you may need to raise custom exceptions with specific status codes. In this tutorial, we will explore how to raise exceptions with custom status codes in Python, enhancing the clarity of error messages and improving the handling of exceptional cases.
Step 1: Understanding the Basics of Exceptions in Python
Before diving into custom status codes, let's review the basics of exceptions in Python. The raise statement is used to trigger an exception manually. Here's a simple example:
This code defines a function that raises a ValueError if the input is negative. The try and except block catches the exception and prints an error message.
Step 2: Creating Custom Exceptions with Status Codes
To attach a custom status code to an exception, you can define a new exception class that inherits from the built-in Exception class. Here's an example:
In this example, CustomException takes two parameters: status_code and message. The status_code is assigned during the exception's instantiation. When the exception is caught, you can access both the error message and the custom status code.
Step 3: Enhancing Exception Handling in Your Code
Now that you have a custom exception with a status code, you can improve your code's readability and error handling by using these custom exceptions strategically. For example:
This code snippet demonstrates how to use a custom exception to handle cases where no data is found. The status code provides additional context about the nature of the error.
Conclusion:
Raising exceptions with custom status codes in Python allows you to create more informative error messages and improve the overall robustness of your code. By following this tutorial, you can enhance your exception handling practices and make your code more readable and maintainable.
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