[Python-ideas] Adding an optional function argument to all() and any() builtins
pyideas at rebertia.com
Sun Nov 21 23:03:07 CET 2010
On Sun, Nov 21, 2010 at 1:35 PM, Masklinn <masklinn at masklinn.net> wrote:
> On 2010-11-21, at 21:43 , Alexander Belopolsky wrote:
>> On Sun, Nov 21, 2010 at 3:20 PM, Masklinn <masklinn at masklinn.net> wrote:
>>> On 2010-11-21, at 21:11 , MRAB wrote:
>>>> if any(mytestfunction(i) for i in mylist):
>>> is not an improvement over `if any(map(mytestfunction, mylist))` or `if any(imap(mytestfunction, mylist))`
>> In 2.7, both MRAB's generator expression solution and your imap() are
>> improvements over map() because they don't create a temporary list.
> Which doesn't actually mean it's an improvement, gencomps are not always faster than map when the transformer is a function in all cases.
In many cases it will be though, because the gencomp is not eagerly
evaluated, unlike listcomps and old map()s. gencomps are also
definitely more memory efficient.
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