Retry decorator

Transient failure recovery.

decorators error-handling

Implement `retry(times: int)` decorator factory.

On each call, if the wrapped function raises an exception, retry up to `times` attempts total. Re-raise the last exception if all attempts fail.

Constraints

times ≥ 1.

Example

@retry(times=3)
def flaky():
    import random
    if random.random() < 0.8: raise RuntimeError
    return 'ok'

28 points ~25 min

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Loop `for _ in range(times): try: return fn(); except: save exc`. Raise after loop.

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