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Re: Comprehension with two variables - explanation needed

From Roy Smith <roy@panix.com>
Newsgroups comp.lang.python
Subject Re: Comprehension with two variables - explanation needed
Date 2014-11-23 10:57 -0500
Organization PANIX Public Access Internet and UNIX, NYC
Message-ID <roy-B11F64.10563923112014@news.panix.com> (permalink)
References <mailman.16184.1416754678.18130.python-list@python.org> <d1194d28-e9ed-4bd3-86e9-899e13a17097@googlegroups.com> <002501d00733$6995dce0$3cc196a0$@gmail.com> <mailman.16191.1416757555.18130.python-list@python.org>

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In article <mailman.16191.1416757555.18130.python-list@python.org>,
 Skip Montanaro <skip.montanaro@gmail.com> wrote:

> > But it breaks all the picture that I've built in my head about comps till
> > now...
> 
> Note that list comprehensions are little more than syntactic sugar for for
> loops. If you're having terrible writing or understanding one, especially a
> compound one like your example, it can help to write it as a (nested) for
> loop, then covert it (perhaps incrementally) to the list comp form.

Or not.  If it was complicated enough that you needed to loopify it to 
understand what it's doing, have pity on the next person who has to 
maintain your code and leave it as a loop :-)

My general rule for code hygiene is, "If I have to think about whether 
something is too complicated, it is".

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Thread

Comprehension with two variables - explanation needed "Ivan Evstegneev" <webmailgroups@gmail.com> - 2014-11-23 16:56 +0200
  Re: Comprehension with two variables - explanation needed Rustom Mody <rustompmody@gmail.com> - 2014-11-23 07:09 -0800
    RE: Comprehension with two variables - explanation needed "Ivan Evstegneev" <webmailgroups@gmail.com> - 2014-11-23 17:37 +0200
    Re: Comprehension with two variables - explanation needed Chris Angelico <rosuav@gmail.com> - 2014-11-24 02:42 +1100
    RE: Comprehension with two variables - explanation needed Skip Montanaro <skip.montanaro@gmail.com> - 2014-11-23 09:45 -0600
      Re: Comprehension with two variables - explanation needed Roy Smith <roy@panix.com> - 2014-11-23 10:57 -0500
        Re: Comprehension with two variables - explanation needed Rustom Mody <rustompmody@gmail.com> - 2014-11-23 08:45 -0800
          Re: Comprehension with two variables - explanation needed Rustom Mody <rustompmody@gmail.com> - 2014-11-23 09:17 -0800
          RE: Comprehension with two variables - explanation needed "Ivan Evstegneev" <webmailgroups@gmail.com> - 2014-11-23 19:27 +0200
          Re: Comprehension with two variables - explanation needed Steven D'Aprano <steve@pearwood.info> - 2014-11-24 04:42 +0000
            Re: Comprehension with two variables - explanation needed Chris Angelico <rosuav@gmail.com> - 2014-11-24 15:51 +1100
              Re: Comprehension with two variables - explanation needed Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-11-25 09:20 +1100
            Re: Comprehension with two variables - explanation needed Rustom Mody <rustompmody@gmail.com> - 2014-11-23 22:47 -0800
            Re: Comprehension with two variables - explanation needed Dan Stromberg <drsalists@gmail.com> - 2014-11-24 16:42 -0800
        Re: Comprehension with two variables - explanation needed Skip Montanaro <skip.montanaro@gmail.com> - 2014-11-23 10:45 -0600
        Re: Comprehension with two variables - explanation needed Roy Smith <roy@panix.com> - 2014-11-23 12:08 -0500
        Re: Comprehension with two variables - explanation needed Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2014-11-23 17:46 +0000

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