Python3.6.5当类的多重继承具有u槽时，“多个基有实例布局冲突”__

Question

如果我运行这个代码，就会得到主题错误消息。但为什么呢？以及如何避免它得到C类的父插槽？在

class A():
        __slots__ = ['slot1']

class B():
        __slots__ = ['slot2']

class C(A, B):
        __slots__ = []

Answer 1

简单地说，你就是做不到。在

如Documentation所述

Multiple inheritance with multiple slotted parent classes can be used, but only one parent is allowed to have attributes created by slots (the other bases must have empty slot layouts) - violations raise TypeError.

__slots__背后的思想是为实例的内存布局中的每个属性保留特定的插槽。^这两个

---

感谢注释中所述的JCode，以下方法已修改为正确。

但是总有办法，如果__slots__是必需的，而有多个继承类，我个人更喜欢使用包含所有必需插槽的公共基。在

import pympler.asizeof
class base():
    __slots__ = ['a','b']

class A(base):
    __slots__ = []

class B(base):
    __slots__ = []

class C(A,B):
    __slots__ = []

class D():
    pass

#Update
bb = base()
bb.a = 100
bb.b = 100
print(pympler.asizeof.asizeof(bb))
a = A()
a.a = 100
a.b = 100
print(pympler.asizeof.asizeof(a))
c = C()
c.a = 100
c.b = 100
print(pympler.asizeof.asizeof(c))
d = D()
d.a = 100
d.b = 100
print(pympler.asizeof.asizeof(d))

更新 这4个值将是88、88、88、312。尽管__slots__保留。在