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Groups > comp.lang.python > #95013

Re: GOTCHA with list comprehension

From Marko Rauhamaa <marko@pacujo.net>
Newsgroups comp.lang.python
Subject Re: GOTCHA with list comprehension
Date 2015-08-05 14:10 +0300
Organization A noiseless patient Spider
Message-ID <87r3nic7oq.fsf@elektro.pacujo.net> (permalink)
References <ebf0a31e-1021-41d2-affb-8318838a464b@googlegroups.com> <mailman.1231.1438758358.3674.python-list@python.org> <87wpxacdnr.fsf@elektro.pacujo.net> <mailman.1234.1438768326.3674.python-list@python.org>

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Chris Angelico <rosuav@gmail.com>:

> On Wed, Aug 5, 2015 at 7:01 PM, Marko Rauhamaa <marko@pacujo.net> wrote:
>> Chris Angelico <rosuav@gmail.com>:
>>
>>> You can chain 'for' and 'if' clauses as much as you like, and they
>>> behave exactly the way you'd expect.
>>
>> How do you know what I'd expect?
>>
>> I wouldn't know what to expect myself.

> [...]

> So what would you expect nested 'if' clauses to do? Well, they become
> nested 'if' statements:
>
> primes = [n for n in range(2,24) if n%2 if n%3]
>
> primes = []
> for n in range(2,24):
>     if n%2:
>         if n%3:
>             primes.append(n)
>
> What if we have multiple 'for' loops? Same thing!

So no need to appeal to my expectations. Better just define it (as you
now did).


Marko

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Thread

GOTCHA with list comprehension Pavel S <pavel@schon.cz> - 2015-08-04 23:48 -0700
  Re: GOTCHA with list comprehension Pavel S <pavel@schon.cz> - 2015-08-05 00:03 -0700
    Re: GOTCHA with list comprehension Chris Angelico <rosuav@gmail.com> - 2015-08-05 17:20 +1000
  Re: GOTCHA with list comprehension Peter Otten <__peter__@web.de> - 2015-08-05 09:04 +0200
  Re: GOTCHA with list comprehension Chris Angelico <rosuav@gmail.com> - 2015-08-05 17:05 +1000
    Re: GOTCHA with list comprehension Pavel S <pavel@schon.cz> - 2015-08-05 00:10 -0700
      Re: GOTCHA with list comprehension Chris Angelico <rosuav@gmail.com> - 2015-08-05 17:21 +1000
        Re: GOTCHA with list comprehension Pavel S <pavel@schon.cz> - 2015-08-05 00:33 -0700
    Re: GOTCHA with list comprehension Marko Rauhamaa <marko@pacujo.net> - 2015-08-05 12:01 +0300
      Re: GOTCHA with list comprehension Chris Angelico <rosuav@gmail.com> - 2015-08-05 19:52 +1000
        Re: GOTCHA with list comprehension Marko Rauhamaa <marko@pacujo.net> - 2015-08-05 14:10 +0300
      Re: GOTCHA with list comprehension Saran Ahluwalia <ahlusar.ahluwalia@gmail.com> - 2015-08-07 09:08 -0400
  Re: GOTCHA with list comprehension Laura Creighton <lac@openend.se> - 2015-08-06 06:39 +0200
  Re: GOTCHA with list comprehension Chris Angelico <rosuav@gmail.com> - 2015-08-06 14:44 +1000

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