class instance customization

Steven D'Aprano steve at REMOVE-THIS-cybersource.com.au
Sat Apr 17 16:32:17 CEST 2010


On Sat, 17 Apr 2010 13:09:43 +0400, Alexander wrote:

> Hi, list.
> 
> I've some nontrivial class implementation MyClass and its instance my:
> 
> my = MyClass(args)
> 
> MyClass uses in internals some variable which is not defined in MyClass
> itself. I want to extend instance of MyClass at runtime defining this
> variable and making new instance. It is like a class inheritance in a
> static way

I'm afraid I don't understand what you are asking. MyClass uses a 
variable which is not defined in MyClass. Where is it defined? Is it a 
global variable?

What do you mean, "like a class inheritance in a static way"?

Perhaps you should give an example of what you want to happen.


> class MyNewClass(MyClass):
>     def __init__(s, a):
>         s._variable = a
> 
> but this doesn't give me ability to make inheritance at runtime of the
> single parent intance. 

Why not?

What is the single parent instance?



> Finaly this should look like this
> 
> my = MyClass(args)
> 
> a1 = my.new(1)
> a2 = my.new(2)
> 
> and e.t.c. Is it possible to release this interface in python?


I'm afraid none of this makes any sense to me. What does the new() method 
do?



-- 
Steven



More information about the Python-list mailing list