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Re: Building CPython

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Steven D'Aprano <steve+comp.lang.python@pearwood.info>:

> On Sat, 16 May 2015 11:59 pm, Marko Rauhamaa wrote:
>> supports multiple inheritance without classes. Maybe I should port that
>> to Python...
>
> I'd like to see it, but somehow I don't think that your "Scheme object
> system" is another name for "closures". We were talking about closures,
> weren't we?

Ok, here's a quick port that have barely tried out:

========================================================================

### Simple OO Framework

class _O: pass

def make_object(*procedures, base=None, bases=None):
    o = _O()
    methods = {}
    setattr(o, '%methods', methods)
    if base is not None:
        inherit_single(o, base)
    elif bases is not None:
        inherit_multi(o, bases)
    for procedure in procedures:
        methods[procedure.__name__] = procedure
        setattr(o, procedure.__name__, procedure)
    return o

def inherit_single(o, base):
    methods = getattr(o, '%methods')
    for name, method in getattr(base, '%methods').items():
        methods[name] = method
        setattr(o, name, method)

def inherit_multi(o, bases):
    for base in bases:
        inherit_single(o, base)

### Used as follows

def TCPClient():
    def connect(socket_address):
        ...
    return make_object(connect)

def SMTPClient():
    tcp_client = TCPClient()
    def connect(host):
        tcp_client.connect((host, 25))
    def send_message(message):
        ...
    return make_object(send_message, base=tcp_client)

client = SMTPClient()
client.connect('mail.example.com')
========================================================================

> I mean, people had to *debate* the introduction of closures? There were
> three competing proposals for them, plus an argument for "don't add them".
> Some people say closures were added in Java 7, others say closures have
> been there since the beginning, and James Gosling himself says that Java
> used inner classes instead of closures but the result was painful...

I'm with those who say anonymous and named inner classes have been there
forever and serve the purpose of closures. Yes, Java's boilerplate
requirements are painful, but if you don't like that, use Python.

> It seems to me that in the Java community, there's a lot of confusion over
> closures, which are seen as an advanced (and rather scary) feature. Hardly
> routine.

Importantly, anonymous inner classes have been in active use by Java
newbs from day one.


Marko

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Building CPython BartC <bc@freeuk.com> - 2015-05-13 20:36 +0100
  Re: Building CPython Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-05-13 20:58 +0100
  Re: Building CPython Terry Reedy <tjreedy@udel.edu> - 2015-05-13 18:34 -0400
    Re: Building CPython BartC <bc@freeuk.com> - 2015-05-14 16:51 +0100
      Re: Building CPython Chris Angelico <rosuav@gmail.com> - 2015-05-15 02:09 +1000
        Re: Building CPython BartC <bc@freeuk.com> - 2015-05-14 18:02 +0100
          Re: Building CPython Dave Angel <davea@davea.name> - 2015-05-14 13:10 -0400
          Re: Building CPython Chris Angelico <rosuav@gmail.com> - 2015-05-15 03:11 +1000
            Re: Building CPython BartC <bc@freeuk.com> - 2015-05-14 18:32 +0100
              Re: Building CPython Chris Angelico <rosuav@gmail.com> - 2015-05-15 03:45 +1000
          Re: Building CPython Terry Reedy <tjreedy@udel.edu> - 2015-05-14 14:50 -0400
            Re: Building CPython Christian Gollwitzer <auriocus@gmx.de> - 2015-05-15 12:51 +0200
              Re: Building CPython Terry Reedy <tjreedy@udel.edu> - 2015-05-15 17:19 -0400
      Re: Building CPython Marko Rauhamaa <marko@pacujo.net> - 2015-05-14 19:29 +0300
        Re: Building CPython BartC <bc@freeuk.com> - 2015-05-14 22:55 +0100
          Re: Building CPython MRAB <python@mrabarnett.plus.com> - 2015-05-14 23:19 +0100
          Re: Building CPython BartC <bc@freeuk.com> - 2015-05-15 01:50 +0100
            Re: Building CPython Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-05-15 18:05 +1200
              Re: Building CPython Marko Rauhamaa <marko@pacujo.net> - 2015-05-15 11:59 +0300
                Re: Building CPython wxjmfauth@gmail.com - 2015-05-15 02:07 -0700
                Re: Building CPython Marko Rauhamaa <marko@pacujo.net> - 2015-05-15 12:20 +0300
                Re: Building CPython wxjmfauth@gmail.com - 2015-05-15 02:51 -0700
                Re: Building CPython Marko Rauhamaa <marko@pacujo.net> - 2015-05-15 13:52 +0300
                Re: Building CPython Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-15 22:10 +1000
                Re: Building CPython Chris Angelico <rosuav@gmail.com> - 2015-05-15 22:34 +1000
                Re: Building CPython wxjmfauth@gmail.com - 2015-05-15 07:11 -0700
                Re: Building CPython Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-05-15 13:41 +0100
                Re: Building CPython Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-05-15 13:38 +0100
                Re: Building CPython Chris Angelico <rosuav@gmail.com> - 2015-05-15 19:43 +1000
                Re: Building CPython Marko Rauhamaa <marko@pacujo.net> - 2015-05-15 13:50 +0300
                Re: Building CPython Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-15 22:43 +1000
                Re: Building CPython Ian Kelly <ian.g.kelly@gmail.com> - 2015-05-15 09:00 -0600
                Re: Building CPython Ian Kelly <ian.g.kelly@gmail.com> - 2015-05-15 09:04 -0600
                Re: Building CPython Chris Angelico <rosuav@gmail.com> - 2015-05-16 01:06 +1000
                Re: Building CPython Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-15 20:14 +1000
                Re: Building CPython Chris Angelico <rosuav@gmail.com> - 2015-05-15 20:25 +1000
                Re: Building CPython Terry Reedy <tjreedy@udel.edu> - 2015-05-15 17:05 -0400
                Re: Building CPython BartC <bc@freeuk.com> - 2015-05-15 22:54 +0100
                Re: Building CPython Marko Rauhamaa <marko@pacujo.net> - 2015-05-16 01:44 +0300
                Re: Building CPython Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-05-16 00:27 +0100
                Re: Building CPython Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-16 11:55 +1000
                Re: Building CPython Chris Angelico <rosuav@gmail.com> - 2015-05-16 12:15 +1000
                Re: Building CPython Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-05-16 03:17 +0100
                Re: Building CPython BartC <bc@freeuk.com> - 2015-05-16 01:43 +0100
                Re: Building CPython MRAB <python@mrabarnett.plus.com> - 2015-05-16 02:16 +0100
                Re: Building CPython Marko Rauhamaa <marko@pacujo.net> - 2015-05-16 11:08 +0300
                Re: Building CPython Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-16 19:40 +1000
                Re: Building CPython Marko Rauhamaa <marko@pacujo.net> - 2015-05-16 16:59 +0300
                Re: Building CPython Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-17 04:18 +1000
                Re: Building CPython Marko Rauhamaa <marko@pacujo.net> - 2015-05-16 21:55 +0300
                Re: Building CPython Marko Rauhamaa <marko@pacujo.net> - 2015-05-17 01:51 +0300
                Re: Building CPython Marko Rauhamaa <marko@pacujo.net> - 2015-05-17 23:49 +0300
                Re: Building CPython Terry Reedy <tjreedy@udel.edu> - 2015-05-15 19:54 -0400
              Re: Building CPython BartC <bc@freeuk.com> - 2015-05-15 10:32 +0100
                Re: Building CPython Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2015-05-16 12:55 +1200
                Re: Building CPython Jonas Wielicki <jonas@wielicki.name> - 2015-05-17 14:25 +0200
                Re: Building CPython BartC <bc@freeuk.com> - 2015-05-17 14:41 +0100

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