Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!)

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Date	Thu, 13 Feb 2014 15:00:05 -0700
Subject	Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!)
From	Ian Kelly <ian.g.kelly@gmail.com>
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On Feb 12, 2014 9:16 PM, "Steven D'Aprano" <steve@pearwood.info> wrote:
>
> On Tue, 11 Feb 2014 07:36:34 -0800, Travis Griggs wrote:
>
> > On Feb 10, 2014, at 10:30 PM, Steven D'Aprano <steve@pearwood.info>
> > wrote:
> >
> >
> >>>    1. Parenthesis should not be required for parameter- less
> >>>    functions.
> >>
> >> Of course they should. Firstly, parameter-less functions are a code-
> >> smell, and ought to be discouraged. Secondly, even if you have a good
> >> reason for using one -- for example, random.random -- then the
> >> difference between referring to the object and calling the object
> >> should be clear.
> >
> > Interesting. Can you clarify or provide some links to the
> > "parameter-less functions are a code-smell" bit?
>
>
> Functions map a value to another value. They can be one-to-one, or many-
> to-one. (Mathematically, they cannot be one-to-many or many-to-many,
> that's called a relation.) What about zero-to-one?
>
> If the function always returns the same result, e.g.:
>
> def spam():
>     return "spam spam spam"

That's still one-to-one. There is no such thing as a zero-to-one mapping.

Mathematical functions map a single value to a single value. To represent
multi-argument functions then, the single input takes on the value of an
ordered sequence. The input value of a 0-argument function then is the
empty sequence.

Thread

PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Rick Johnson <rantingrickjohnson@gmail.com> - 2014-02-10 10:45 -0800
  Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-10 19:15 +0000
  Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Ned Batchelder <ned@nedbatchelder.com> - 2014-02-10 14:17 -0500
  Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Rotwang <sg552@hotmail.co.uk> - 2014-02-10 21:12 +0000
    Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Ned Batchelder <ned@nedbatchelder.com> - 2014-02-10 17:00 -0500
    Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Terry Reedy <tjreedy@udel.edu> - 2014-02-10 17:59 -0500
  Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Chris Angelico <rosuav@gmail.com> - 2014-02-11 09:30 +1100
  Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Steven D'Aprano <steve@pearwood.info> - 2014-02-11 06:30 +0000
    Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Tim Chase <python.list@tim.thechases.com> - 2014-02-11 09:26 -0600
    Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Travis Griggs <travisgriggs@gmail.com> - 2014-02-11 07:36 -0800
      Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2014-02-11 18:07 +0200
        Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Chris Angelico <rosuav@gmail.com> - 2014-02-12 03:14 +1100
      Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Steven D'Aprano <steve@pearwood.info> - 2014-02-13 04:11 +0000
        Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Chris Angelico <rosuav@gmail.com> - 2014-02-13 15:30 +1100
          Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Roy Smith <roy@panix.com> - 2014-02-13 09:58 -0500
            Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Chris Angelico <rosuav@gmail.com> - 2014-02-14 06:17 +1100
        Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Tim Chase <python.list@tim.thechases.com> - 2014-02-13 05:39 -0600
        Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Tim Chase <python.list@tim.thechases.com> - 2014-02-13 05:51 -0600
        Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Ian Kelly <ian.g.kelly@gmail.com> - 2014-02-13 15:00 -0700
    Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Chris Angelico <rosuav@gmail.com> - 2014-02-12 02:52 +1100
    Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Travis Griggs <travisgriggs@gmail.com> - 2014-02-11 08:19 -0800
    Re: PyWart: More surpises via "implict conversion to boolean" (and other steaming piles!) Terry Reedy <tjreedy@udel.edu> - 2014-02-11 12:57 -0500

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