[Python] When appending object of a class to a list, whole list are overwritten by last...

When appending an instance of a class to a list, whole list are overwritten by last object. Which other option we have if we don't want to use "deepcopy"

class Person:
def __init__(self):
self.age = None

list_of_lists = []
p1=Person()

p1.age=40

list_of_lists.append(p1)

p1.age=20
list_of_lists.append(p1)


for objpid3 in list_of_lists:
print(objpid3.age)


Result

20 20

Expected result

40 20

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