Python class inheritance - Base is modified by a subclass

Let's say I have a class called Test with an attribute items. Then I create a subclass called Best. Which has a method that modifies the classes attribute items. But it even modifies Test's items and I what it to modify items only for Best.

class Test():
    items = []

class Best(Test):
    def method(self):
        type(self).items.append("a test")

>>> Best().method()
>>> Best.items
["a test"]
>>> Test.items 
["a test"]            # This is what I don't want.