经典类和新式类的区别,c3算法

class A(object):
    pass

class B(A):
    pass

class C(B):
    pass

class D(object):
    pass

class E(D,C):
    pass

class F(object):
    pass

class G(F):
    pass

class H(C,G):
    pass

class Foo(E,H):
    pass


# print(E.__mro__)  #查找E类的查找顺序
# print(H.__mro__)
"""
L(Foo + L(E)  + L(H) )

L(E) = E,D,C,B,A,object
L(H) = H,C,B,A,G,F,object

Foo = (object) + (G,F,object)
Foo,E,D,H,C,B,A,G,F,object
"""
print(Foo.__mro__)#(<class ‘__main__.Foo‘>, <class ‘__main__.E‘>,
#  <class ‘__main__.D‘>, <class ‘__main__.H‘>, <class ‘__main__.C‘>,
#  <class ‘__main__.B‘>, <class ‘__main__.A‘>, <class ‘__main__.G‘>,
#  <class ‘__main__.F‘>, <class ‘object‘>)


查找口头解释

   获取第一个表头 和 其他表位进行比较
   不存在则拿走。
   如果存在，则放弃，然后获取第二个表的表头再次和其他表的表尾进行比较。