Nested class structures

[John Lenton]

On Sat, Sep 11, 2004 at 12:28:44AM +0000, OKB (not okblacke) wrote:
>     	Yeah, sorry, I should have been a little more clear.  Anyway, it's 
> important that these be actual class definitions, because I want the 
> ability to include per-class methods and stuff.  So I don't really want 
> a bunch of identical anonymous classes.  I want something like:
> 
> class class1:
>     	class anon:
>     	    	def meth1(self): print "meth1"
>    	class anon:
>     	    	def meth1(self): print "different meth1"
>     	class anon:
>     	    	def meth1(self): print "another meth1"
> 
>     	This is why I want to define the classes inline, nested in the 
> other class.  I'm trying to leverage the syntactic structure of class 
> definitions to get nested structures of code.  It's somewhat akin to
> 
> a = { 'one': 1,
>     	'nested': { 'two': 2, 'three': 3,
>     	    	'nestnest': { 'four': 4, 'five': 5 }
>     	}
>     	'othernest': { 'six': 6 }
>     }
> 
>     	. . . except that I want the ability to include arbitrary python 
> code where I have 1, 2, 3 there (as dictionary values).  As far as 
> I can tell, Python doesn't provide a way to define code as part of 
> a larger expression like this, except in a class definition.

Two things. First, I don't understand (you don't explain) your
requirement for the classes to be 'anonymous'; the example in the dict
can be made easily, with

    class a:
      one = 1
      class nested:
        two = 2
        three = 3
        class nestnest:
    .
    .
    .


but obviously there's something more to it.

Second, a class is an object like any other; you can include it in a
dictionary (that's all a nested class is doing, really, with some
sugar to get at it in convenient ways), push it into a list,
whatever. They're even hashable, so you can use them as dictionary
keys.


-- 
John Lenton (john at grulic.org.ar) -- Random fortune:
Don't tell any big lies today.  Small ones can be just as effective.
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