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Re: lambdak: multi-line lambda implementation in native Python

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References <3d8068b3-7b63-43c0-bbf2-6111b2c73aa4@googlegroups.com> <roy-4AAFA6.08034915012015@news.panix.com> <mailman.17759.1421327478.18130.python-list@python.org> <87zj9kb2j0.fsf@elektro.pacujo.net> <roy-A43F6D.20334015012015@news.panix.com> <54B86CF8.7040602@gmail.com>
Date Fri, 16 Jan 2015 15:00:12 +1100
Subject Re: lambdak: multi-line lambda implementation in native Python
From Chris Angelico <rosuav@gmail.com>
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On Fri, Jan 16, 2015 at 12:44 PM, Michael Torrie <torriem@gmail.com> wrote:
> On 01/15/2015 06:34 PM, Roy Smith wrote:
>> The ebb and flow of technology has recently brought me someplace I never
>> thought I'd be.  Java-land.  And what I've discovered is that factories
>> are so last year.  Apparently builders are the new thing.
>
> It's never clear to me whether all these fancy design patterns are to
> make up for a deficient language, or whether some people just get their
> kicks from layer upon layer of abstraction.  Certainly it's this sort of
> thing that turns me right off of Java.

My first response was going to be "Well, you can always add another
layer of indirection to try to solve your problem", but then I went
and looked up builders on Wikipedia. Now I'm confused. What can you do
with a builder that you can't do with a constructor? Is this to get
around style guides that reject this kind of model:

x = Foo(
    opt1=True,
    opt2=True,
    color=Yellow,
)

so you instead do this?

x = Foo.Builder()
x.opt1 = True
x.opt2 = True
x.color = Yellow
x = x.get()

How is that an improvement?

In Python, of course, keyword arguments do this job brilliantly, but
I'm aware that not all languages support them. Okay. But if you can
pass a mapping object to the constructor, you can do the same job that
way, and even if you can't do that, you could pass an array of
item,value,item,value,item,value or something. Surely there must be
some way that would work.

ChrisA

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lambdak: multi-line lambda implementation in native Python yawar.amin@gmail.com - 2015-01-14 21:54 -0800
  Re: lambdak: multi-line lambda implementation in native Python Steven D'Aprano <steve@pearwood.info> - 2015-01-15 06:06 +0000
    Re: lambdak: multi-line lambda implementation in native Python Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-14 23:39 -0700
      Re: lambdak: multi-line lambda implementation in native Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-16 01:29 +1100
        Re: lambdak: multi-line lambda implementation in native Python Skip Montanaro <skip.montanaro@gmail.com> - 2015-01-15 08:38 -0600
      Re: lambdak: multi-line lambda implementation in native Python Yawar Amin <yawar.amin@gmail.com> - 2015-01-15 18:07 -0800
        Re: lambdak: multi-line lambda implementation in native Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-16 15:17 +1100
    Re: lambdak: multi-line lambda implementation in native Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-01-15 17:22 +0000
  Re: lambdak: multi-line lambda implementation in native Python Roy Smith <roy@panix.com> - 2015-01-15 08:04 -0500
    Re: lambdak: multi-line lambda implementation in native Python Chris Angelico <rosuav@gmail.com> - 2015-01-16 00:09 +1100
    Re: lambdak: multi-line lambda implementation in native Python Skip Montanaro <skip.montanaro@gmail.com> - 2015-01-15 07:11 -0600
      Re: lambdak: multi-line lambda implementation in native Python Marko Rauhamaa <marko@pacujo.net> - 2015-01-15 15:24 +0200
        Re: lambdak: multi-line lambda implementation in native Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-16 01:24 +1100
          Re: lambdak: multi-line lambda implementation in native Python Chris Angelico <rosuav@gmail.com> - 2015-01-16 01:50 +1100
          Re: lambdak: multi-line lambda implementation in native Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-01-15 19:47 -0500
            Re: lambdak: multi-line lambda implementation in native Python Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-01-17 00:21 +1300
              Re: lambdak: multi-line lambda implementation in native Python Marko Rauhamaa <marko@pacujo.net> - 2015-01-16 14:06 +0200
                Re: lambdak: multi-line lambda implementation in native Python Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-01-17 10:24 +1300
                Re: lambdak: multi-line lambda implementation in native Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-17 21:33 +1100
                Re: lambdak: multi-line lambda implementation in native Python alister <alister.nospam.ware@ntlworld.com> - 2015-01-17 18:30 +0000
        Re: lambdak: multi-line lambda implementation in native Python Roy Smith <roy@panix.com> - 2015-01-15 20:34 -0500
          Re: lambdak: multi-line lambda implementation in native Python Michael Torrie <torriem@gmail.com> - 2015-01-15 18:44 -0700
          Re: lambdak: multi-line lambda implementation in native Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-01-16 02:14 +0000
          Re: lambdak: multi-line lambda implementation in native Python Chris Angelico <rosuav@gmail.com> - 2015-01-16 15:00 +1100
            Re: lambdak: multi-line lambda implementation in native Python Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-01-17 10:29 +1300
              Re: lambdak: multi-line lambda implementation in native Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-17 21:30 +1100
                Re: lambdak: multi-line lambda implementation in native Python Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2015-01-17 12:49 +0200
                Re: lambdak: multi-line lambda implementation in native Python Marko Rauhamaa <marko@pacujo.net> - 2015-01-17 13:07 +0200
                Re: lambdak: multi-line lambda implementation in native Python Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2015-01-17 13:59 +0200
                Re: lambdak: multi-line lambda implementation in native Python Marko Rauhamaa <marko@pacujo.net> - 2015-01-17 14:15 +0200
                Re: lambdak: multi-line lambda implementation in native Python Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2015-01-17 14:54 +0200
                Re: lambdak: multi-line lambda implementation in native Python Skip Montanaro <skip.montanaro@gmail.com> - 2015-01-17 06:19 -0600
                Re: lambdak: multi-line lambda implementation in native Python Jussi Piitulainen <jpiitula@ling.helsinki.fi> - 2015-01-17 15:19 +0200
                Re: lambdak: multi-line lambda implementation in native Python Roy Smith <roy@panix.com> - 2015-01-17 12:24 -0500
                Re: lambdak: multi-line lambda implementation in native Python Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-01-18 11:41 +1300
                Re: lambdak: multi-line lambda implementation in native Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-17 23:48 +1100
                Re: lambdak: multi-line lambda implementation in native Python Roy Smith <roy@panix.com> - 2015-01-17 12:20 -0500
                Re: lambdak: multi-line lambda implementation in native Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-18 13:45 +1100
                Re: lambdak: multi-line lambda implementation in native Python Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2015-01-17 17:21 -0500
                Re: lambdak: multi-line lambda implementation in native Python Danilo Coccia <daniloco@acm.org> - 2015-01-17 15:20 +0100
                Re: lambdak: multi-line lambda implementation in native Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-17 23:49 +1100
                Re: lambdak: multi-line lambda implementation in native Python Chris Angelico <rosuav@gmail.com> - 2015-01-18 00:33 +1100
                Re: lambdak: multi-line lambda implementation in native Python Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-01-18 10:56 +1300
                Re: lambdak: multi-line lambda implementation in native Python Chris Angelico <rosuav@gmail.com> - 2015-01-18 09:04 +1100
                Re: lambdak: multi-line lambda implementation in native Python Roy Smith <roy@panix.com> - 2015-01-17 11:56 -0500
                Re: lambdak: multi-line lambda implementation in native Python Grant Edwards <invalid@invalid.invalid> - 2015-01-17 18:51 +0000
                Re: lambdak: multi-line lambda implementation in native Python Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-01-18 10:48 +1300
              Re: lambdak: multi-line lambda implementation in native Python Grant Edwards <invalid@invalid.invalid> - 2015-01-17 18:44 +0000
                Re: lambdak: multi-line lambda implementation in native Python Dan Sommers <dan@tombstonezero.net> - 2015-01-17 19:08 +0000
                Re: lambdak: multi-line lambda implementation in native Python alister <alister.nospam.ware@ntlworld.com> - 2015-01-17 20:22 +0000
          Factories and Builders [was Re: lambdak...] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-16 16:08 +1100
            Re: Factories and Builders [was Re: lambdak...] Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-01-17 10:25 +1300
          Re: lambdak: multi-line lambda implementation in native Python Ian Kelly <ian.g.kelly@gmail.com> - 2015-01-15 22:29 -0700
          Re: lambdak: multi-line lambda implementation in native Python Ethan Furman <ethan@stoneleaf.us> - 2015-01-15 21:42 -0800
          Re: lambdak: multi-line lambda implementation in native Python Michael Torrie <torriem@gmail.com> - 2015-01-16 09:23 -0700
  Re: lambdak: multi-line lambda implementation in native Python Rustom Mody <rustompmody@gmail.com> - 2015-01-15 09:19 -0800
    Re: lambdak: multi-line lambda implementation in native Python Yawar Amin <yawar.amin@gmail.com> - 2015-01-15 18:18 -0800
      Re: lambdak: multi-line lambda implementation in native Python Rustom Mody <rustompmody@gmail.com> - 2015-01-15 18:48 -0800
        Re: lambdak: multi-line lambda implementation in native Python Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-01-16 03:02 +0000
          Re: lambdak: multi-line lambda implementation in native Python Rustom Mody <rustompmody@gmail.com> - 2015-01-15 19:14 -0800
        Re: lambdak: multi-line lambda implementation in native Python Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-01-16 15:16 +1100
          Re: lambdak: multi-line lambda implementation in native Python Rustom Mody <rustompmody@gmail.com> - 2015-01-15 20:58 -0800
  Re: lambdak: multi-line lambda implementation in native Python Rick Johnson <rantingrickjohnson@gmail.com> - 2015-01-15 19:06 -0800
    Re: lambdak: multi-line lambda implementation in native Python Yawar Amin <yawar.amin@gmail.com> - 2015-01-15 19:20 -0800

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