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class Base1: def __init__(self, *args): print("Base1.__init__", args) class Ctuple1(Base1, tuple): pass a = Ctuple1() print(len(a)) a = Ctuple1([1, 2, 3]) print(len(a)) print("---") class Ctuple2(tuple, Base1): pass a = Ctuple2() print(len(a)) a = Ctuple2([1, 2, 3]) print(len(a))