List append

[mouseit]

I'm trying to add an element to a list which is a property of an
object, stored in an array. When I append to one element, all of the
lists are appended!

Example Code:

class Test:
    array = []

myTests = [Test() , Test() , Test()]
print len(myTests[1].array)
myTests[0].array.append( 5 )
print len(myTests[1].array)

prints:
0
1

This is probably a really easy question (I'm very new to python), so
thanks in advance for your help!