[Python-ideas] Allow filter(items)

[Shane Green]

You ever want to add an efficient ident() to __builtins__ so you could stop using lambda and normalize a bunch of things?


On Aug 7, 2013, at 1:55 AM, Serhiy Storchaka <storchaka at gmail.com> wrote:

> 07.08.13 11:43, Stephen J. Turnbull написав(ла):
>> One of the things I like about Python is that it mostly manages to
>> eschew magic values (like "None" meaning "bool") and spurious brevity
>> (like defaulting the predicate).  While "bool" may be the most common
>> predicate here, it's not obvious to me what the absence of the
>> predicate means.  On both counts, I'm against this (or any) default.
>> 
>> Specifically, in most of the applications where I personally would
>> want to use something like "filter", zeros and empty lists are typically
>> valid values.  So I'd want to filter "None" or similar "not available"
>> values.  Therefore I would expect "is not None" to be the default.
> 
> The default predicate is not "bool". The default is identity function (lambda x: x).
> 
> 
> _______________________________________________
> Python-ideas mailing list
> Python-ideas at python.org
> http://mail.python.org/mailman/listinfo/python-ideas

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-ideas/attachments/20130807/d5372079/attachment.html>