Real Python: Python's raise: Effectively Raising Exceptions in Your Code

The raise statement in Python is used to signal an error or unusual condition in a program, and can be used to trigger both built-in and custom exceptions. Raising an exception halts normal program flow and signals an error condition. The raise statement is used to initiate exceptions for error handling or to propagate existing exceptions. Custom exceptions can be raised by defining new exception classes derived from Exception. The difference between raise and assert lies in their use, with assert used for debugging and raise used to signal runtime errors. A bare raise within an except block can be used to re-raise an exception and preserve the original traceback. Learning about the raise statement allows developers to handle errors and exceptional situations effectively in their code. Exceptions play a fundamental role in Python, allowing developers to handle errors and exceptional situations in their code. When a problem occurs in a program, Python automatically raises an exception, which can be handled using a try-except block. If an exception is not handled, it will propagate until it reaches the main program, where it will halt with an exception traceback.