Re: Idea for key parameter in all() builting, would it be feasible?

References	<9150d9b7-e488-4f9f-beff-4a140bcc78f0@googlegroups.com> <mailman.3619.1371725131.3114.python-list@python.org> <e55a88ed-b603-454e-b027-09160866cad6@googlegroups.com>
Date	2013-06-21 01:48 +1000
Subject	Re: Idea for key parameter in all() builting, would it be feasible?
From	Chris Angelico <rosuav@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.3628.1371743295.3114.python-list@python.org> (permalink)

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On Fri, Jun 21, 2013 at 12:49 AM, Russel Walker <russ.pobox@gmail.com> wrote:
> On Thursday, June 20, 2013 12:45:27 PM UTC+2, Antoon Pardon wrote:
>> Op 19-06-13 18:14, russ.pobox@gmail.com schreef:
>>
>> >
>>
>> >>>> all(map(lambda x: bool(x), xrange(10**9)))
>>
>> Since you already have your answer, I just like to get your attention
>> to the fact the the lambda is superfluous here. Your expression
>> above is equivallent to
>>
>>   all(map(bool, xrange(10**9)))
>
> That's true, I didn't notice that. Although it was a trivial example I was setting up from the actual code and couldn't think of what to shove inside lambda so bool got the short straw.

Yeah, I've been guilty of that fairly often - making a trivial example
that can be trivialized even more. Sometimes all you need to do is
acknowledge it with a comment and move on, other times the additional
trivialization is a clue to the actual problem :)

In this particular case, all() will boolify anyway, so you don't even
need map. But that would completely destroy your example:

all(xrange(10**9)) # Doesn't help with figuring out the original issue!

ChrisA

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Idea for key parameter in all() builting, would it be feasible? russ.pobox@gmail.com - 2013-06-19 09:14 -0700
  Re: Idea for key parameter in all() builting, would it be feasible? Chris Angelico <rosuav@gmail.com> - 2013-06-20 02:20 +1000
  Re: Idea for key parameter in all() builting, would it be feasible? russ.pobox@gmail.com - 2013-06-19 09:32 -0700
    Re: Idea for key parameter in all() builting, would it be feasible? Chris Angelico <rosuav@gmail.com> - 2013-06-20 02:39 +1000
      Re: Idea for key parameter in all() builting, would it be feasible? Russel Walker <russ.pobox@gmail.com> - 2013-06-20 03:05 -0700
  Re: Idea for key parameter in all() builting, would it be feasible? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-06-20 12:45 +0200
    Re: Idea for key parameter in all() builting, would it be feasible? Russel Walker <russ.pobox@gmail.com> - 2013-06-20 07:49 -0700
      Re: Idea for key parameter in all() builting, would it be feasible? Chris Angelico <rosuav@gmail.com> - 2013-06-21 01:48 +1000

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