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Re: from future import pass_function

From Terry Reedy <tjreedy@udel.edu>
Subject Re: from future import pass_function
Date 2012-07-26 10:38 -0400
References <d1o4e9-tlr.ln1@satorlaser.homedns.org> <mailman.2575.1343232342.4697.python-list@python.org> <t957e9-qs1.ln1@satorlaser.homedns.org>
Newsgroups comp.lang.python
Message-ID <mailman.2611.1343313543.4697.python-list@python.org> (permalink)

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On 7/26/2012 2:39 AM, Ulrich Eckhardt wrote:

> I have seen code that just created a list comprehension to iterate over
> something but was discarding the results.

If you mean, discard the resulting list, that is probably bad code as it 
should not create the list in the first place. A generator expression or 
for loop will iterate without creating an unneeded list.

 > That could be a case for a "do nothing" function.

Such code does do something within the comprehension.

> Just having a function that does nothing

Not possible. None is the default return. Python does not have 
proceedures, and that is not going to change, especially for a null 
proceedure.

-- 
Terry Jan Reedy

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Thread

from future import pass_function Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-07-25 10:40 +0200
  Re: from future import pass_function Philipp Hagemeister <phihag@phihag.de> - 2012-07-25 12:30 +0200
  Re: from future import pass_function Nicholas Cole <nicholas.cole@gmail.com> - 2012-07-25 11:33 +0100
  Re: from future import pass_function Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-07-25 07:02 -0400
  Re: from future import pass_function Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-25 11:33 +0000
    Re: from future import pass_function Ross Ridge <rridge@csclub.uwaterloo.ca> - 2012-07-25 21:42 -0400
      Re: from future import pass_function Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-26 02:38 +0000
        Re: from future import pass_function Ross Ridge <rridge@csclub.uwaterloo.ca> - 2012-07-25 23:30 -0400
          Re: from future import pass_function Chris Angelico <rosuav@gmail.com> - 2012-07-26 13:53 +1000
            Re: from future import pass_function Ross Ridge <rridge@csclub.uwaterloo.ca> - 2012-07-26 00:03 -0400
              Re: from future import pass_function Ethan Furman <ethan@stoneleaf.us> - 2012-07-25 21:32 -0700
                Re: from future import pass_function John Ladasky <john_ladasky@sbcglobal.net> - 2012-07-26 13:55 -0700
                Re: from future import pass_function Ethan Furman <ethan@stoneleaf.us> - 2012-07-26 14:23 -0700
                Re: from future import pass_function John Ladasky <john_ladasky@sbcglobal.net> - 2012-07-26 15:20 -0700
                Re: from future import pass_function John Ladasky <john_ladasky@sbcglobal.net> - 2012-07-26 15:20 -0700
                Re: from future import pass_function John Ladasky <john_ladasky@sbcglobal.net> - 2012-07-26 13:55 -0700
              Re: from future import pass_function Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-07-26 08:43 +0100
          Re: from future import pass_function alex23 <wuwei23@gmail.com> - 2012-07-25 21:20 -0700
        Re: from future import pass_function Rusi <rustompmody@gmail.com> - 2012-07-25 22:09 -0700
        Re: from future import pass_function Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-07-26 08:59 +0200
          Re: from future import pass_function Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-26 09:26 +0000
            Re: from future import pass_function Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-07-26 13:45 +0200
              Re: from future import pass_function Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-26 15:21 +0000
                Re: from future import pass_function Joel Goldstick <joel.goldstick@gmail.com> - 2012-07-26 12:55 -0400
                RE: from future import pass_function "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2012-07-26 17:19 +0000
                Re: from future import pass_function Chris Angelico <rosuav@gmail.com> - 2012-07-27 03:33 +1000
                Re: from future import pass_function Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-07-27 00:25 +0100
                Re: from future import pass_function Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-07-27 00:23 +0100
      Re: from future import pass_function alex23 <wuwei23@gmail.com> - 2012-07-25 21:17 -0700
  Re: from future import pass_function Chris Angelico <rosuav@gmail.com> - 2012-07-26 02:05 +1000
    Re: from future import pass_function Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-07-26 08:39 +0200
      Re: from future import pass_function Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-26 08:36 +0000
      Re: from future import pass_function Terry Reedy <tjreedy@udel.edu> - 2012-07-26 10:38 -0400
  Re: from future import pass_function Ethan Furman <ethan@stoneleaf.us> - 2012-07-25 09:28 -0700
  Re: from future import pass_function Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-07-25 12:48 -0400
  Re: from future import pass_function Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-07-25 14:17 -0400
  Re: from future import pass_function Michael Hrivnak <mhrivnak@hrivnak.org> - 2012-07-26 01:20 -0400
    Re: from future import pass_function Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-07-26 08:42 +0200
      Re: from future import pass_function Michael Hrivnak <mhrivnak@hrivnak.org> - 2012-07-26 17:15 -0400
  Re: from future import pass_function Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-07-26 08:50 +0100
    Re: from future import pass_function Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-07-27 08:39 +0200
  Re: from future import pass_function Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-07-26 05:16 -0400
  Re: from future import pass_function Chris Angelico <rosuav@gmail.com> - 2012-07-26 19:42 +1000
  Re: from future import pass_function Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-07-26 06:00 -0400
  Re: from future import pass_function rusi <rustompmody@gmail.com> - 2012-07-26 08:01 -0700
  Re: from future import pass_function Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-07-26 14:01 -0400
  Re: from future import pass_function Chris Angelico <rosuav@gmail.com> - 2012-07-27 04:14 +1000
  Re: from future import pass_function John Ladasky <john_ladasky@sbcglobal.net> - 2012-07-26 13:48 -0700
    Re: from future import pass_function Ian Kelly <ian.g.kelly@gmail.com> - 2012-07-26 15:18 -0600
    Re: from future import pass_function Ethan Furman <ethan@stoneleaf.us> - 2012-07-26 15:35 -0700
    Re: from future import pass_function Terry Reedy <tjreedy@udel.edu> - 2012-07-27 00:21 -0400
  Re: from future import pass_function Michael Hrivnak <mhrivnak@hrivnak.org> - 2012-07-26 17:20 -0400

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