class ParentClass:
    def __init__(self, *, x, y):
        self.x = x
        self.y = y
 
class DerivedClass(ParentClass):
    def __init__(self, *args, **kargs):
        print("Doing some extra work...")
        super().__init__(*args, **kargs)
 
def actuallyAssert(expr):
	if not expr:
		raise Exception("Assert failed!")
 
obj = DerivedClass(x=23, y=42)
actuallyAssert(obj.x == 23)
actuallyAssert(obj.y == 42)
print("If you can read this, it worked")

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