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Re: Iterators membership testing

References <88256581-75d4-4f77-81f0-9e3e25baecbc@googlegroups.com> <CAPTjJmoibrvoxFt7o3XA+h_5ETTCS1b9uNUOhK=1UpRvo3PTpQ@mail.gmail.com> <20150809080917.2c87f22f@bigbox.christie.dr>
Date 2015-08-09 23:11 +1000
Subject Re: Iterators membership testing
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.6.1439125888.3627.python-list@python.org> (permalink)

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On Sun, Aug 9, 2015 at 11:09 PM, Tim Chase <tim@thechases.com> wrote:
> On 2015-08-09 19:24, Chris Angelico wrote:
>> That's exactly right. The only way for the interpreter to handle
>> 'in' on an iterator is something like this:
>>
>> def contains(iter, obj):
>>     for val in iter:
>>         if val == obj: return True
>>     return False
>
> Which can nicely be written as
>
>   any(i == obj for obj in iter)

Indeed it can, although I'm not sure whether it'd just have been
another step in the explanation :) Whether or not that makes perfect
sense depends on the reader.

ChrisA

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Thread

Iterators membership testing Pierre Quentel <pierre.quentel@gmail.com> - 2015-08-09 02:06 -0700
  Re: Iterators membership testing Chris Angelico <rosuav@gmail.com> - 2015-08-09 19:24 +1000
    Re: Iterators membership testing Pierre Quentel <pierre.quentel@gmail.com> - 2015-08-09 02:55 -0700
      Re: Iterators membership testing Chris Angelico <rosuav@gmail.com> - 2015-08-09 20:13 +1000
        Re: Iterators membership testing Pierre Quentel <pierre.quentel@gmail.com> - 2015-08-09 04:00 -0700
          Re: Iterators membership testing Chris Angelico <rosuav@gmail.com> - 2015-08-09 21:10 +1000
      Re: Iterators membership testing Laura Creighton <lac@openend.se> - 2015-08-09 13:30 +0200
      Re: Iterators membership testing Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-08-09 14:49 +0100
  Re: Iterators membership testing Chris Angelico <rosuav@gmail.com> - 2015-08-09 23:11 +1000
  Re: Iterators membership testing Tim Chase <python.list@tim.thechases.com> - 2015-08-09 08:09 -0500
  Re: Iterators membership testing Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-08-09 14:45 +0100
  Re: Iterators membership testing Tim Chase <tim@thechases.com> - 2015-08-09 08:09 -0500

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