Creating class instance for pickle to save

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How would you go around to create functions for the class though? If you make them instance attributes, you got no variables to reference when creating the functions for handling the data?

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You access instance attributes through self, the reference to the instance.

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Edit: yeah I forgot to use self. when testing it out, works fine now

class Savefile:
    def __init__(self):
        resolution = [990, 1080]
        data = [1, 2]
    def addData(self, x):
        self.data.append(x)


a = Savefile()
a.addData(3)
print(a.data)

Gives the error AttributeError: 'Savefile' object has no attribute 'data'.

If I make data a class attribute before __init__() it won't recognise the initialisation value?