Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #83867

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

Path csiph.com!usenet.pasdenom.info!news.etla.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed1a.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path <ian.g.kelly@gmail.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.008
X-Spam-Evidence '*H*': 0.98; '*S*': 0.00; 'subject:Python': 0.06; 'defaults': 0.07; 'arguments,': 0.09; 'constructor': 0.09; 'python': 0.11; 'jan': 0.12; '"well,': 0.16; 'builders': 0.16; 'optional': 0.16; 'wrote:': 0.18; 'looked': 0.18; 'thu,': 0.19; 'issue.': 0.22; 'separate': 0.22; 'builder': 0.24; 'java': 0.24; '15,': 0.26; 'header:In-Reply-To:1': 0.27; 'chris': 0.29; 'message-id:@mail.gmail.com': 0.30; "i'm": 0.30; 'went': 0.31; 'layer': 0.31; 'subject:skip:i 10': 0.31; 'another': 0.32; "can't": 0.35; 'problem.': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'add': 0.35; 'there': 0.35; 'combination': 0.36; 'to:addr:python-list': 0.38; 'pm,': 0.38; 'to:addr:python.org': 0.39; 'solve': 0.60; 'first': 0.61; '2015': 0.84; '9:00': 0.91
DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=iiPN3XcbV7VmbTO3sCSN3Vn+GfWlHNqXf6UrM95d/oQ=; b=v6+qL5THszr5ED7qtsUFu0awXLGzMssk9T96IA7ovFTLlIhKS7BO7J0bgD3W7eqrI/ Z/845kHld13tvOHewLV+yS/ZZvxnjqG66uC33Q1eZe26f7csLP2LjP9tn3PUb+2v5OK3 7r2ikR0PU62rurl1OSo8gh+jCxZpQXQQspIypR5zyBrdLlcmnS1lbu5/O8xrcjiTFVjF ffyIj1J647y/xpfr8EpOBugl7lUSHGqqffqF+rqrAByKqa7N5rcYxH6pbqVgZu0GhO8y RPiDVm2Z6Zjy5pivlvXYyA2cqh1UrS+Ro/VGMvzqDtOW9xRf92x9sG/I1nyW1ZmI5hq3 YVXQ==
X-Received by 10.66.148.73 with SMTP id tq9mr19972819pab.22.1421386201346; Thu, 15 Jan 2015 21:30:01 -0800 (PST)
MIME-Version 1.0
In-Reply-To <CAPTjJmqLq0S1+cGWp8evb_k9QaXVHQ91Hj=bdQnzSAzKLUmneQ@mail.gmail.com>
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> <CAPTjJmqLq0S1+cGWp8evb_k9QaXVHQ91Hj=bdQnzSAzKLUmneQ@mail.gmail.com>
From Ian Kelly <ian.g.kelly@gmail.com>
Date Thu, 15 Jan 2015 22:29:21 -0700
Subject Re: lambdak: multi-line lambda implementation in native Python
To Python <python-list@python.org>
Content-Type text/plain; charset=UTF-8
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.15
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups comp.lang.python
Message-ID <mailman.17786.1421386636.18130.python-list@python.org> (permalink)
Lines 13
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1421386636 news.xs4all.nl 2889 [2001:888:2000:d::a6]:41590
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:83867

Show key headers only | View raw

On Thu, Jan 15, 2015 at 9:00 PM, Chris Angelico <rosuav@gmail.com> wrote:
> 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?

In Java you have to write a separate constructor for every conceivable
combination of arguments. If there are a lot of optional arguments,
that's an exponentially large number of constructors. The builder
pattern provides a solution to that problem.

In Python you just have one initializer with defaults for the optional
arguments, so it's not an issue.

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

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