python OOP,访问属性

Question

当我尝试从NewOne类访问属性"self.b"时,为什么会出现"AttributeError:'NewOne'对象没有属性'self.b'"错误消息.我的意思是它就在那里.

class NewOne(object):  
    def __init__(self):
        self.b = 'Cat' # this is what i want to access
    def child(self):
        self.c = 'kitten'
        return self.c

class FatherClass(object):
    def __init__(self, a):
        self.a = a
    def son(self):
        self.i = 'I and my father'
        return self.i
    def father(self):
        self.x = 'are one'
        return self.x
    def father_son(self):
        u = NewOne()
        k = getattr(u, 'self.b') #why does it tell me NewOne has no self.b attr
        return self.a, k()

getattr用于访问方法吗？为什么它被称为getattr而不是getmeth或什么？谢谢

Answer 1

替换这个:

k = getattr(u, 'self.b')

这样:

k = getattr(u, 'b')

或者甚至更好:

k = u.b