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Message: [QUOTE="Terry Reedy, post: 5104029"] Bare except statements cover up too many sins. I and others *strongly* recommend that you only catch what you *know* you actually want to (see below). I recommend that you start with at least one test case, and with an edge case at that. If you cannot bring yourself to do it before writing a draft of the function code, do it immediately after and run. If you do not want to use a framework, use assert. assert supersum([]) == 0 assert supersum([], []) == [] Do the asserts match your intention? The tests amount to a specification by example. Any 'kind' of input that is not tested is not guaranteed to work. Back to the except clause: only add try..except xxx when needed to pass a test. [/QUOTE]