namespace question

[T. Crane]

Hi,

If I define a class like so:

class myClass:
    import numpy
    a = 1
    b = 2
    c = 3

    def myFun(self):
        print a,b,c
        return numpy.sin(a)


I get the error that the global names a,b,c,numpy are not defined.  Fairly 
straightforward.  But if I am going to be writing several methods that keep 
calling the same variables or using the same functions/classes from numpy, 
for example, do I have to declare and import those things in each method 
definition?  Is there a better way of doing this?

thanks,
trevis