On Thu, Feb 4, 2010 at 4:59 AM, Jean-Michel Pichavant < jeanmic...@sequans.com> wrote:
> What the hell is this 'for else' loop !! :D First time I see this statement > for years. > I'd never thought I'd still learn something that basic. > Its one of the least used constructs in Python, I think, and leads to periodic statements like this on the list where people who think they know all about Python suddenly see it and go WTF :) But in Python, all loops have an "else" clause that is fired when the loop terminates-- but *only* if it terminates normally, where 'normally' is basically, 'if you don't use break to exit the loop prematurely'. It allows you to do certain things in a way which is (arguably, and I so don't want to start an argument about this) a bit cleaner, where the normal method would require a flag or some such. For example, if you need want to loop over a sequence to test to see if they all match some criteria, you can use a for..else, or some flag variable. --S
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