Python类继承

Question

可能重复:
子类_​​_init__覆盖超类

class A():
    z = 'z it is'
    def __init__(self):
        self.a = 'a it is'

class B(A):
    def __init__(self):
        self.b = 'b it is'

b = B()
print b.z # z it is 
print b.a # AttributeError: B instance has no attribute 'a'

b是B从A类继承的类的实例.这是否意味着我可以访问父类的属性？

Answer 1

您需要显式调用超类__init__.它不会自动调用.