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From: Marko Rauhamaa <marko@pacujo.net>
Newsgroups: comp.lang.python
Subject: Re: List of Functions
Date: Tue, 29 Mar 2016 07:49:38 +0300
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Steven D'Aprano <steve@pearwood.info>:

> On Tue, 29 Mar 2016 08:40 am, Chris Angelico wrote:
>
>> On Tue, Mar 29, 2016 at 12:40 AM, Marko Rauhamaa <marko@pacujo.net> wrote:
>>> Dan Sommers <dan@tombstonezero.net>:
>>>
>>>> On Mon, 28 Mar 2016 11:58:54 +0300, Marko Rauhamaa wrote:
>>>>> As for Python, I don't feel a great need for anonymous functions.
>>>>> However, I keep running into a need for anonymous classes, or,
>>>>> rather, classless objects. Not a biggie. I just create a one-off
>>>>> inner class and instantiate it, but I do appreciate Java's
>>>>> syntactic innovation.
>
> "Classless object" is an oxymoron in Python since all values without
> exception have a class. Can you explain what you mean?

In class terms, I mean a closure class that has precisely one instance.
Just like a closure function has precisely one instance.

In object terms, I mean an object that implements an interface but whose
class is not of essence.

> Also, for the benefit of those who aren't Java coders, what do you mean
> by "Java's syntactic innovation"?

        HelloWorld frenchGreeting = new HelloWorld() {
            String name = "tout le monde";
            public void greet() {
                greetSomeone("tout le monde");
            }
            public void greetSomeone(String someone) {
                name = someone;
                System.out.println("Salut " + name);
            }
        };

        <URL: https://docs.oracle.com/javase/tutorial/java/javaOO/anonym
        ousclasses.html>


Marko