[Python] Why does sys.getsizeof() report the same size for two instances even though one has...

import sys

class MyObject:
def __init__(self,name,salary):
self.name = name
self.salary = salary

obj1 = MyObject("Tushar", 50)
obj2 = MyObject("Tushar", 50)
obj2.age = 20

print(sys.getsizeof(obj1)) # 56
print(sys.getsizeof(obj2)) # 56


Why is obj2 only 56 bytes when it has an extra age attribute?

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