sys.getsizeof reaturn misleading result

[intellimath]

sys.getsizeof for dataclass-based instance return the size of the basic instance structure: PyGC_Head + reference to the type of the instance + refcount + refernce to __dict__ + refrence to __weakref__ = 24+8+8+8+8=56. It don't count the space for attribute's values from __dict__ and the space for __dict__ instance.