I'm having trouble understanding scope of a variable in a subclass

[Gabriel Genellina]

At Thursday 28/12/2006 03:18, Pyenos wrote:

>class Class1:
>     class Class2:
>         class Class3:
>             def __init__(self):
>                 self.var="var"
>             class Class4:
>                 print Class1.Class2.Class3.var
>
>This code gives me the error:
>Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
>   File "<stdin>", line 2, in Class1
>   File "<stdin>", line 3, in Class2
>   File "<stdin>", line 6, in Class3
>   File "<stdin>", line 7, in Class4
>NameError: name 'Class1' is not defined

- put your print statement inside a method
- as I've said, try to grab the difference between an instance 
attribute and a class attribute.

var is an attribute of Class3 instances (because you wrote self.var = 
something), so you need a Class3 instance to access it.
Class3 is a class attribute of Class2. Class2 is an instance 
attribute of Class1. Putting all this together, you can refer to such 
"var" as Class1.Class2.Class3().var


-- 
Gabriel Genellina
Softlab SRL 


	

	
		
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