Question

我是python中的初学者...我写了这段代码，期望输出为，

global name:xxx
derived class
base class
globally declared function has been called
globally declared function has been called

但是我得到了以下输出，

Global name:xxx
derived class
derived class
base class
None 
Globally declared function has been called
Globally declared function has been called

究竟是什么逻辑？我哪里出错？

这是我的代码：

Name=raw_input("Global name:")
def display():
    print "Globally declared function has been called"
class base(object):
    def __init__(self):
        self.bname='base class'
        print self.bname
    def bfun1(self):
        display()
class derived(base):
    def __init__(self):
        self.dname="derived class"
        print self.dname
    def bshow(self):
        self.bsname=raw_input(super(derived,self).__init__())
        print self.bsname
        display()
ob=derived()
ob.__init__()
ob.bshow()
ob.bfun1()

Answer 1

您不需要明确调用.__init__()。在创建对象时已经调用它; ob = derived()为您调用.__init__()。

稍后，在bshow()中，您明确地呼叫base.__init__()，但包含在raw_input()电话中。由于base.__init__()没有明确的return语句（它不应该有），raw_input()会打印函数的{em>默认返回值，{{1} }。

以下代码将更接近您的预期：

None

这个程序的流程是什么？

1 个答案: