Issue Using Deepcopy With Dictionary Inside Object

Reading the documentation, I understood that copy.deepcopy(obj) copies recursively any other object inside this one, but when I run: >>> import copy >>> class Som

Solution 1:

Deepcopy only copies instance attributes. Your b attribute is a class attribute, instead.

Even if you did not create a copy but a new instance of SomeObject manually, b would still be shared:

>>>classSomeObject:...    a=1...    b={1:1,2:2}...>>>so1 = SomeObject()>>>so2 = SomeObject()>>>so1.b is so2.b
True
>>>so1.b is SomeObject.b
True

Make b an instance attribute:

>>>import copy>>>classSomeObject:...    a = 1...def__init__(self):...        self.b = {1: 1, 2: 2}...>>>so1 = SomeObject()>>>so2 = copy.deepcopy(so1)>>>so1.b is so2.b
False