Python Singleton objects with the same attribute should reference to the same object

I want Python to return the same object when the instances are created with the similar attributes. Also when I am changing some attribute of one instance, that attribute should be synchronized between other instances also.

class Session:
    def __init__(self, id):
        self.id = id 
        self.data = None

session1 = Session(1)
session1.data = 202
print(session1.data) # 202
print(id(session1)) # should be 1111

session11 = Session(1)
print(session11.data) # 202
print(id(session11)) # should be the same as session1 -> 1111

session2 = Session(2)
print(id(session2)) # 2222

You can see above that I want session1 and session1a be the same object because of Session(1), while session2 is another object because of Session(2).

How could I do it?