List not passing between methods inside a class definition

[ichabod801]

Your last line should be c.add(d). You want to call it from the instance, so the instance parameter (self) is automatically filled. Also note that the print in the add method should be print(self.a), since a is an attribute of the instance. Finally, what I was talking about with the a parameter to __init__ was more like this:

def __init__(self, a = None):
    if a is None:
        a = []
    self.a = a
    print(a)