runtimequestion 180 Exceptions & Validation · hard
Retry a flaky call, but only when it's worth it
A price service sometimes times out and works on the next try; other failures (a bad request) will fail every time. Write a helper that retries only the temporary kind. Define TemporaryFailure, then with_retries(action, attempts).
Error type
TemporaryFailure, a kind of ExceptionFunction
with_retries(action, attempts): call action() (no arguments) up to attempts timesReturnsthe result of the first call that succeeds
Retriesonly after
TemporaryFailure; when every attempt raises it, raise the last one againOther errorsescape at once, without another attempt
Bad input
attempts below 1 raises ValueError("attempts must be at least 1") without calling action