How do I declare global vars or class vars in Python ?

[Bruno Desthuilliers]

Nick Craig-Wood a écrit :
(snip)
> Note that in python we don't normally bother with getA/setA normally,
> just use self.A, eg
> 
> class Stuff(object):
>     def __init__(self):
>         self.A = None
>         self.B = None
>     def main(self):
>         print self.A
>         print self.B
>         # dosomething
>         self.A = "aValue"
>         self.B = "aValue"
>         print self.A
>         print self.B
> 
>>>> a = Stuff()
>>>> a.main()
> None
> None
> aValue
> aValue
>>>>  
> 
> If you need (later) A to be a computed value then you turn it into a
> property, which would look like this.  (Note the main method is
> identical to that above).
> 
> class Stuff(object):
>     def __init__(self):
>         self._A = None

Note that while you *can* do direct access to the implementation 
attribute (here, '_A' for property 'A'), you don't *need* to so (and 
usually shouldn't - unless you have a very compelling reason).