How to Raise Exception | Summary and Q&A

TL;DR

Learn how to raise and handle exceptions in Python to manually control error messages and handling.

Key Insights

• 🤨 Exceptions can be raised manually using the raise keyword, allowing for custom error messages and control over error handling.
• 🚫 Try-except blocks are used to catch and handle exceptions in Python.
• ✋ Exceptions can be handled within the same function or propagated to higher-level function calls.
• 🤨 Unhandled exceptions are raised to the interpreter and result in a traceback message.

Transcript

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Questions & Answers

Q: How do you raise an exception manually in Python?

To raise an exception manually, use the raise keyword followed by the desired error class and an optional error message. For example, raise ValueError("Invalid input") would raise a ValueError exception with the message "Invalid input".

Q: Can exceptions be caught and handled within the same function?

Yes, exceptions raised within a function can be caught and handled within the same function using a try-except block. If the exception is not handled within the function, it will be raised to the calling code.

Q: What happens if an exception is not handled in the code?

If an exception is not handled within the code, it will be raised to the interpreter, which will display a traceback message showing the sequence of function calls that led to the unhandled exception.

Q: Can exceptions be raised and handled in nested function calls?

Yes, exceptions can be raised and handled in nested function calls. If an exception is raised in a nested function, it will be propagated up the call stack until it is caught and handled by an appropriate try-except block.

Summary & Key Takeaways

• The content discusses how to create and handle different types of exceptions using the try and except blocks in Python.

• It explains how to raise an exception manually using the raise keyword and provide custom error messages.

• The video demonstrates examples of raising and handling exceptions in different scenarios, including nested function calls.