On Aug 30, 4:31 pm, Ben Finney <[EMAIL PROTECTED]>
wrote:
> [EMAIL PROTECTED] writes:
> > In my case of have done os.listdir() on two directories. I want to see
> > what files are in directory A that are not in directory B.
>
> You get that information unambiguously. It's an exceptional case,
> since there's no index to return, so it throws an exception.
>
> > I have used exceptions in other languages and only do so on logic
> > that should never happen.
>
> You're confusing "assert" ("this should always be true") with
> "exception" ("this is an exception to the the normal flow of this
> process").
>
> An exception isn't "something that should never happen", it's
> something that is entirely possible and needs to be handled somehow.
I don't think that is the definition used across computer science.
It suddenly dawned on me that what would be best would be a contains()
(or IN syntax for those who can't afford to wait) for lists.
if mylist.contains("hello):
>
> --
> \ "Always do right. This will gratify some people, and astonish |
> `\ the rest." -- Mark Twain |
> _o__) |
> Ben Finney
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