python繼承關系中，類屬性的修改

class Grandfather(object):
    mylist = []
    def __init__(self):
        pass
class Father(Grandfather):
    pass

Grandfather.mylist = [1, 2, 3, 4]
print(Grandfather.mylist)
print(Father.mylist)
Father.mylist = ['a']
Grandfather.mylist = ['b']
print(Father.mylist)
print(Grandfather.mylist)
print(Father.mylist)

輸出結果：

[1, 2, 3, 4]
[1, 2, 3, 4]
['a']
['b']
['a']

從上面的實驗可以看出，子類繼承父類后，初始狀態下，繼承了父類的屬性。

當在子類中修改繼承過來的類屬性時，並不會修改父類的同名類屬性。以后只要是通過子類訪問該屬性，訪問的都是子類的屬性；

通過父類修改了父類屬性后，子類訪問該屬性時，會訪問父類修改后的屬性值。前提是子類沒有對該屬性重新賦值過，如果子類修改過該屬性，則會遵循上面的規則