(第一篇)__mro__和__dict__

# __mro__ 查找继承顺序
class A(object):
    pass


class B(A):
    pass


class C(object):
    pass


class D(B, C):
    pass


print(D.__mro__)    # (<class '__main__.D'>, <class '__main__.B'>, <class '__main__.A'>, <class '__main__.C'>, <class 'object'>)，先从B的继承查找A，再找C，所以我们常用继承类优先写在前面，提高一点执行速度

 

# __dict__ 找对象的属性

class Func(object):
    dream = "police"

    def __init__(self, name, age):
        self.name = name
        self.age = age

    def test(self, x):
        return x+1

# 找类对象里的属性
print(Func.__dict__)  # {'__module__': '__main__', 'dream': 'police', '__init__': <function Func.__init__ at 0x000002791FDCB0D0>, 'test': <function Func.test at 0x000002791FDCBEE0>, '__dict__': <attribute '__dict__' of 'Func' objects>, '__weakref__': <attribute '__weakref__' of 'Func' objects>, '__doc__': None}
obj = Func("hc", 24)
# 找实例对象里的属性
print(obj.__dict__) # {'name': 'hc', 'age': 24}