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[Python-ideas] unify usage of mutable and immutable objects
语言破碎处mlet_it_bew at 126.com
Tue Feb 28 13:13:59 EST 2017
> That is simply misspelled for your intent.Take a look at the following function in Haskell (GHC) Data.Set minView :: Set a -> Maybe (a, Set a)We always want the new set after a immutable set pop(). "e = a.pop()" is fine for mutable set, but not for immutable case. we need "e, a = a.pop()" to update "a".在 2017-03-01 01:23:54，"David Mertz" <mertz at gnosis.cx> 写道：On Tue, Feb 28, 2017 at 5:59 AM, 语言破碎处 <mlet_it_bew at 126.com> wrote:bad example: a = set() a.add(1) # return None; "a" changed e = a.pop();That is simply misspelled for your intent.a = set()a |= {1}e = a.pop()--Keeping medicines from the bloodstreams of the sick; foodfrom the bellies of the hungry; books from the hands of theuneducated; technology from the underdeveloped; and puttingadvocates of freedom in prisons. Intellectual property isto the 21st century what the slave trade was to the 16th.-------------- next part --------------An HTML attachment was scrubbed...URL: <http://mail.python.org/pipermail/python-ideas/attachments/20170301/48e79401/attachment.html>
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