> class MyClass: > def __init__(self, data): > self.private_data = data > MyInitialization() > def MyInitialization(self): .... close!, you just have to remember to use self to refer to class methods, like this: > class MyClass: > def __init__(self, data): > self.private_data = data > self.MyInitialization() ^^^^ > def MyInitialization(self): ...