raise — Intermediate Playground

Throws an exception manually

Python Playground

# Re-raise the current exception
def process(data):
    try:
        return int(data)
    except ValueError:
        print(f"Warning: could not process {data!r}")
        raise  # re-raise the same exception

try:
    process("abc")
except ValueError as e:
    print(f"Caught re-raised: {e}")

# Exception chaining with 'from'
class AppError(Exception):
    pass

def load_config(path):
    try:
        raise FileNotFoundError(f"No such file: {path}")
    except FileNotFoundError as e:
        raise AppError("Configuration failed") from e

try:
    load_config("config.yaml")
except AppError as e:
    print(f"Error: {e}")
    print(f"Caused by: {e.__cause__}")

Output

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Bare 'raise' re-throws the current exception. 'raise X from Y' chains exceptions, setting __cause__ for traceback clarity.

Challenge

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?

View all Intermediate examples for raise