There is a subtle point though. If the substring is not found '_'.find(' '), will return -1 Semanticly, I was expecting the that if the substring was not found, the conditional statement would not be found. However, python evaluates -1 to True, so that is what I do find confusing. So, I was arguing that '_'.find(' ') might return 0, however that is obviously ambigious, since 0 might be an index as well.
So, perhaps I should rephrase and ask, why if -1 evaluates to True? I think that's pretty ugly... cheers, -jelle
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