[Python-ideas] Allow filter(items)

[Shane Green]

If I read a snippet from the earlier emails correctly, it’s interesting to note that, if not for a trick in the C code that turned bool back into None, the predicate bool would in fact be a redundant transformation. 


On Aug 7, 2013, at 5:14 AM, Stephen J. Turnbull <stephen at xemacs.org> wrote:

> Serhiy Storchaka writes:
> 
>> The default predicate is not "bool". The default is identity function 
>> (lambda x: x).
> 
> IIUC correctly, the intent is "bool", it just happens that it's more
> efficient to spell it "lambda x: x" when you don't actually need a
> Boolean value.
> 
> 
> 
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