How to re-raise an exception in an except block?

To re-raise an exception handled in an except block, simply use the raise keyword without arguments. This will propagate the exception up the call stack after executing the code in the except block.

try:
    # Code that may raise an exception
    result = 1 / 0
except ZeroDivisionError as e:
    # Handle the exception (e.g., logging)
    print(f"Division by zero error occurred: {e}")
    # Re-raise the exception
    raise

If you need to raise a different exception or add information to the current one, you can use raise exception from current_exception.

try:
    # Code that may raise an exception
    data = {}
    value = data['key']
except KeyError as e:
    # Caught a KeyError
    print(f"Key access error: {e}")
    # Raise a new exception, linking it to the original
    raise ValueError("Invalid data format") from e