[Python-ideas] Variations on a loop

[Georg Brandl]

Bruce Leban schrieb:
> 
> On Fri, Aug 29, 2008 at 1:47 PM, David Blaschke
> <dwblas at gmail.com
> <mailto:dwblas at gmail.com>> wrote:
> 
>     This idea
>     elif x == funky_empty:
>           result = 'no data'
> 
>     Can be accomplished with
>     if not len(items):
>           result = 'no data'
>     which means that part of the proposal can be scratched IMHO.
> 
> 
> Not quite: len(items) requires iterating across the entire list which
> may not be necessary or desirable. Plus you may need an intermediate
> variable to store it. I think that's inferior.

This is moot anyway: in general, iterators have no __len__().

Georg

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