Is a list static when it's a class member?

[glue]

I have a class with a list member and the list seems to behave like
it's static while other class members don't. The code...

class A:
    name = ""
    data = []
    def __init__(self, name):
        self.name = name
    def append(self, info):
        self.data.append(info)
    def enum(self):
        for x in self.data:
            print "\t%s" % x

a = A("A:")
print a.name
a.append("one")
a.append("two")
a.enum()
b = A("B:")
print b.name
b.append("horse")
b.append("bear")
b.enum()
print a.name
a.enum()

The output...
>>>
A:
	one
	two
B:
	one
	two
	horse
	bear
A:
	one
	two
	horse
	bear
>>>

How do i get:
A:
        one
        two
B:
        horse
        bear
A:
        one
        two

Thanks,

glue