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Re: Method Chaining

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From Michael Selik <michael.selik@gmail.com>
Newsgroups comp.lang.python
Subject Re: Method Chaining
Date Fri, 17 Jun 2016 04:23:57 +0000
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On Thu, Jun 16, 2016 at 10:53 PM Lawrence D’Oliveiro <lawrencedo99@gmail.com>
wrote:

> Example from <http://default-cube.deviantart.com/art/Truchet-612095093>,
> concisely expressing a complex drawing sequence:
>
>     (g
>         .move_to((p1 + p2a) / 2)
>         .line_to(p1 + (p2 - p1) * frac)
>         .line_to((p1 + p1a) / 2)
>         .stroke()
>         .move_to((p2 + p2a) / 2)
>         .line_to(p2 + (p1 - p2) * frac)
>         .line_to((p2 + p1a) / 2)
>         .stroke()
>     )
>

Wouldn't that look nicer with the ``g`` repeated on every line, no extra
indentation, and no extraneous parentheses?

    g.move_to((p1 + p2a) / 2)
    g.line_to(p1 + (p2 - p1) * frac)
    g.line_to((p1 + p1a) / 2)
    g.stroke()
    g.move_to((p2 + p2a) / 2)
    g.line_to(p2 + (p1 - p2) * frac)
    g.line_to((p2 + p1a) / 2)
    g.stroke()

Sometimes it's hard to know when a function has a side-effect. I appreciate
that these impure functions tend to return None.

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Thread

Method Chaining Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-16 19:02 -0700
  Re: Method Chaining Steven D'Aprano <steve@pearwood.info> - 2016-06-17 12:39 +1000
  Re: Method Chaining Michael Selik <michael.selik@gmail.com> - 2016-06-17 04:23 +0000
    Re: Method Chaining Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-16 21:37 -0700
      Re: Method Chaining Ned Batchelder <ned@nedbatchelder.com> - 2016-06-17 01:13 -0700
        Re: Method Chaining Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-17 01:38 -0700
          Re: Method Chaining Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-06-17 11:45 +0300
        Re: Method Chaining Steven D'Aprano <steve@pearwood.info> - 2016-06-17 19:28 +1000
          Re: Method Chaining Michael Selik <michael.selik@gmail.com> - 2016-06-17 13:34 +0000
            Re: Method Chaining Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-17 15:26 -0700
              Re: Method Chaining Michael Selik <michael.selik@gmail.com> - 2016-06-17 22:45 +0000
              Re: Method Chaining Michael Selik <michael.selik@gmail.com> - 2016-06-17 23:10 +0000
          Re: Method Chaining Rustom Mody <rustompmody@gmail.com> - 2016-06-17 09:48 -0700
            Re: Method Chaining Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-17 15:25 -0700
            Re: Method Chaining Pete Forman <petef4+usenet@gmail.com> - 2016-06-18 13:04 +0100
              Re: Method Chaining Joonas Liik <liik.joonas@gmail.com> - 2016-06-18 17:05 +0300
                Re: Method Chaining Pete Forman <petef4+usenet@gmail.com> - 2016-06-18 16:42 +0100
              Re: Method Chaining Rustom Mody <rustompmody@gmail.com> - 2016-06-18 08:35 -0700
                Re: Method Chaining Pete Forman <petef4+usenet@gmail.com> - 2016-06-19 11:16 +0100
              Re: Method Chaining Ethan Furman <ethan@stoneleaf.us> - 2016-06-18 13:47 -0700
              Re: Method Chaining Joonas Liik <liik.joonas@gmail.com> - 2016-06-19 14:56 +0300
              Re: Method Chaining Ethan Furman <ethan@stoneleaf.us> - 2016-06-19 08:01 -0700
              Re: Method Chaining Michael Torrie <torriem@gmail.com> - 2016-06-19 09:14 -0600
              Re: Method Chaining Ethan Furman <ethan@stoneleaf.us> - 2016-06-19 08:56 -0700
                Re: Method Chaining Rustom Mody <rustompmody@gmail.com> - 2016-06-19 09:03 -0700
        Re: Method Chaining Lawrence D’Oliveiro <lawrencedo99@gmail.com> - 2016-06-17 15:22 -0700
          Re: Method Chaining Ned Batchelder <ned@nedbatchelder.com> - 2016-06-17 17:02 -0700

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