How to Reraise Exceptions in Python?

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To reraise exceptions in Python, you can use the raise statement without any arguments within an exception handling block. This will re-raise the currently active exception, allowing it to be propagated up the call stack. Here’s an example:

try:
    # Code that may raise an exception
    raise ValueError("Custom error message")
except ValueError as e:
    # Exception handling code
    print("An exception occurred:", str(e))
    # Reraise the exception
    raise

In this example, within the try block, an exception of type ValueError is raised with a custom error message. In the except block, the exception is caught and the error message is printed. Then, the raise statement without any arguments is used to reraise the exception.

By reraising the exception, the control flow is returned to the point where the exception was initially raised, allowing it to be handled by an outer exception handler or, if unhandled, causing the program to terminate and display the exception traceback.

Reraising exceptions is useful when you want to catch and handle specific exceptions in a local scope but still allow the exception to propagate up the call stack for further handling or reporting at a higher level.

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