R. David Murray added the comment: Ah, now I understand your confusion. Class variables are special. The first time you reference a name on an instance that is not currently defined on that instance but is defined on the class, the interpreter gets the object pointer from the class reference. It then performs the operation, and assigns the result to the *instance* attribute. This is how class attributes work, and is an integral part of Python. This is documented in the 'class instances' section of https://docs.python.org/3/reference/datamodel.html#objects-values-and-types.
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