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Groups > comp.lang.python > #44455

Re: Comparison Style

From Terry Jan Reedy <tjreedy@udel.edu>
Subject Re: Comparison Style
Date 2013-04-27 17:40 -0400
References <125c8f33-1a62-4dc0-9341-a2d8f7b58058@googlegroups.com> <CAPTjJmq6afVuQnXCyXNFV1QvYi_Pt2qT9tCmjBVUSvqOLunEhA@mail.gmail.com> <nqpjn81vrbluuegvj1ggvuhegdcvki6743@invalid.netcom.com> <mailman.1077.1366944517.3114.python-list@python.org> <roy-FE66BC.17031527042013@news.panix.com>
Newsgroups comp.lang.python
Message-ID <mailman.1130.1367098839.3114.python-list@python.org> (permalink)

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On 4/27/2013 5:03 PM, Roy Smith wrote:
> In article <mailman.1077.1366944517.3114.python-list@python.org>,
>   Chris Angelico <rosuav@gmail.com> wrote:
>
>> If you switch the order of operands in that, the compiler won't help
>> you. Plus it "reads" wrong. So the convention is still
>> variable==constant.
>
> I just found a nice example of putting the constant first.  I've just
> done a whole bunch of ugly math to find some slice limits.  To make sure
> they're sane, I'm writing:
>
>          assert 5 <= i < j < original_song_count
>
> I can't think of any way to write that which would be as clean and easy
> to read.

Chained comparisons like this are standard math notation, which is why 
Python 'does the right thing' with them.

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Thread

Comparison Style llanitedave <llanitedave@veawb.coop> - 2013-04-24 22:49 -0700
  Re: Comparison Style Chris Angelico <rosuav@gmail.com> - 2013-04-25 15:57 +1000
    Re: Comparison Style llanitedave <llanitedave@veawb.coop> - 2013-04-25 07:19 -0700
      Re: Comparison Style Chris Angelico <rosuav@gmail.com> - 2013-04-26 02:25 +1000
      Re: Comparison Style Steve Simmons <square.steve@gmail.com> - 2013-04-25 19:31 +0100
        Re: Comparison Style llanitedave <llanitedave@veawb.coop> - 2013-04-25 13:13 -0700
          Re: Comparison Style Neil Cerutti <neilc@norwich.edu> - 2013-04-25 20:15 +0000
          Re: Comparison Style Steve Simmons <square.steve@gmail.com> - 2013-04-25 21:35 +0100
          Re: Comparison Style Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-04-26 10:02 +0100
  Re: Comparison Style Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-04-25 22:37 -0400
  Re: Comparison Style Chris Angelico <rosuav@gmail.com> - 2013-04-26 12:48 +1000
    Re: Comparison Style Roy Smith <roy@panix.com> - 2013-04-27 17:03 -0400
      Re: Comparison Style Terry Jan Reedy <tjreedy@udel.edu> - 2013-04-27 17:40 -0400
  Re: Comparison Style Dave Angel <davea@davea.name> - 2013-04-25 23:43 -0400

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