Newbie Class Questions

[Joe Mason]

In article <94CdnVqi7o8rn_vdRVn-vg at centurytel.net>, Ed Suominen wrote:
> I think it would be cool for my "AutoText" class (see below, hereby GPL'd)
> to be able to tell what subclasses inherit from it and instantiate objects
> for all of those subclasses to implement a "AutoAll" function.. Any ideas?

Check out http://www.phyast.pitt.edu/~micheles/python/meta1.html and
http://www.phyast.pitt.edu/~micheles/python/meta2.html.  It's advanced,
but it'll do what you want.

I just used your question as an example in the "Prothon Prototypes vs
Python Classes" thread, including the actual metaclass that'll do what
you want.  Here it is again:

    autoall = []
    def AutoAll():
        l = []
        for i in autoall:
            l.append(i())
        return l

    class AutoRegister(type):
        def __init__(klass, name, bases, dict):
            autoall.append(klass)

Then just add the line "__metaclass__ = AutoRegister" to your AutoText
definition, and all its subclasses will automatically inherit it.

> I have all of 3 days experience with OOP and Python, so please bear with me. 

Might be a little early for metaclasses, then...

Joe