Ethan Furman ethan at stoneleaf.us
Mon Mar 19 20:37:19 CET 2012

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Nick Coghlan wrote:
> Collapsing the address list has to build the result list anyway to
> actually handle the deduplication part of its job, so returning a
> concrete list makes sense in that case.

Having only one function return a list instead of an iterator seems 
questionable.

Depending on the code it could either keep track of what it has returned 
so far in a set and avoid duplication that way; or, just return an 
`iter(listobject)` instead of `listobject`.

~Ethan~

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