[Python-ideas] __iter__ implies __contains__?

[Raymond Hettinger]

On Oct 3, 2011, at 3:22 AM, Greg Ewing wrote:

> Passing non-reiterable objects around is not something that
> I think should be encouraged. 

Really?   Passing around iterators is a basic design pattern
http://en.wikipedia.org/wiki/Iterator_pattern for lots of languages.

You may have a personal programming style that avoids
iterators, but that shouldn't be forced on the rest of the community.

The only way for a broad categories of iterators to become
reiterable is for their outputs to be stored in memory (thus
defeating the just-in-time memory conserving property of
many iterators).


Raymond
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