importtimefromtypingimportProtocol,runtime_checkable@runtime_checkableclassHasX(Protocol):x:intclassFoo:@propertydefx(self)->int:return42classBar:x=42classBaz:def__init__(self):self.x=42classEgg: ...classNominal(HasX):def__init__(self):self.x=42classRegistered: ...HasX.register(Registered)num_instances=500_000foos= [Foo()for_inrange(num_instances)]bars= [Bar()for_inrange(num_instances)]bazzes= [Baz()for_inrange(num_instances)]basket= [Egg()for_inrange(num_instances)]nominals= [Nominal()for_inrange(num_instances)]registereds= [Registered()for_inrange(num_instances)]defbench(objs,title):start_time=time.perf_counter()forobjinobjs:isinstance(obj,HasX)elapsed=time.perf_counter()-start_timeprint(f"{title}:{elapsed:.2f}")bench(foos,"Time taken for objects with a property")bench(bars,"Time taken for objects with a classvar")bench(bazzes,"Time taken for objects with an instance var")bench(basket,"Time taken for objects with no var")bench(nominals,"Time taken for nominal subclass instances")bench(registereds,"Time taken for registered subclass instances")