Re: Factories and Builders [was Re: lambdak...]

Path	csiph.com!usenet.pasdenom.info!gegeweb.org!eternal-september.org!feeder.eternal-september.org!news.swapon.de!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From	Gregory Ewing <greg.ewing@canterbury.ac.nz>
Newsgroups	comp.lang.python
Subject	Re: Factories and Builders [was Re: lambdak...]
Date	Sat, 17 Jan 2015 10:25:37 +1300
Lines	19
Message-ID	<chtduhF3h6cU2@mid.individual.net> (permalink)
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> <54b89cc7$0$12975$c3e8da3$5496439d@news.astraweb.com>
Mime-Version	1.0
Content-Type	text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding	7bit
X-Trace	individual.net GONBypdH1g2F5PUatm0jXA4r2dvTd4Okzkyc/HlHqIjmUNB6o0
Cancel-Lock	sha1:BIju2EXnUfdDaIFpuUDRxpxAENM=
User-Agent	Mozilla Thunderbird 1.0.5 (Macintosh/20050711)
X-Accept-Language	en-us, en
In-Reply-To	<54b89cc7$0$12975$c3e8da3$5496439d@news.astraweb.com>
Xref	csiph.com comp.lang.python:83900

Show key headers only | View raw

Steven D'Aprano wrote:
> I've never really understand why "abstract factory", "factory method"
> and "builder" are considered different design patterns. They're variants on
> the same idea.

I think it's because they address different problems. Factories
are for hiding the details of how an object is constructed.
Builders are for working around the fact that there are no
keyword arguments in your language.

Builders are sometimes also used for algorithmic reasons;
e.g. Java's StringBuilder exists to save you from O(n**2)
behaviour when creating a string from many small parts.

Factories of various kinds can be useful in Python;
builders, not so much.

-- 
Greg

Thread

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

csiph-web