Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!news-1.dfn.de!news.dfn.de!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: Neil Cerutti <neilc@norwich.edu>
Newsgroups: comp.lang.python
Subject: Re: Language design
Date: 12 Sep 2013 18:06:44 GMT
Organization: Norwich University
Lines: 34
Message-ID: <b9ee5kForo6U1@mid.individual.net>
References: <522eb795$0$29999$c3e8da3$5496439d@news.astraweb.com> <5230D58E.9020508@markusrother.de> <5230DD68.2080703@stoneleaf.us> <mailman.321.1379008290.5461.python-list@python.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Trace: individual.net G4FuDkF+XP/vL2OHohb72QYLVrA4+jy8BxO6h18DY5xlXVutW5
Cancel-Lock: sha1:Uq6q4bF+i6IFCBuY+YSMZdWUhao=
User-Agent: slrn/0.9.9p1/mm/ao (Win32)
Xref: csiph.com comp.lang.python:54072

On 2013-09-12, Markus Rother <python@markusrother.de> wrote:
> On 11.09.2013 23:15, Ethan Furman wrote:
>> On 09/11/2013 01:41 PM, Markus Rother wrote:
>>>      >>> () == []
>>>      False
>>>
>>>      But:
>>>
>>>      >>> bool(().__eq__([]))
>>>      True
>> 
>> This is not a trap, this is simply the wrong way to do it.  The magic
>> methods (aka dunder methods) are there for Python to call, not you
>> (except under special circumstances, such as when writing your own
>> dunder methods).
>
> While trying to do it, I learned that its not the right way to do it.
> However, I was not satisfied with the fact, that there is no built in
> pure function for operations on primitives.  Such that
>
>>>> def get_do_stuff (fn):
> ...     def do_stuff(x,y):
> ...         return fn(x,y)
> ...     return do_stuff
>
> I understand that python is not a functional language, but it
> frustrates me at times.

>>> import operator
>>> equal = get_do_stuff(operator.eq)(7, 7.0)
True

-- 
Neil Cerutti