回溯：在greet中出现NameError

Question

有没有人能帮我解决这个问题？
我收到了这个信息：

Traceback: in in greet NameError: global name 'name' is not defined

来自这个：

class Person:
    def __init__(self, name):
        self.name = name
    def greet(self, other_name):
        return "Hi {0}, my name is {1}".format(other_name, name)

Answer 1

name 是 Person 类的一个实例属性。这意味着你在访问它的值时，需要在前面加上 self.：

return "Hi {0}, my name is {1}".format(other_name, self.name)
#                                                  ^^^^^

Answer 2

在greet函数里，name这个变量不在可用范围内。你需要用self.name来代替。比如：

class Person:
    def __init__(self, name):
        self.name = name
    def greet(self, other_name):
        self.other_name = other_name
        return "Hi {0}, my name is {1}".format(other_name, self.name)

你可以验证一下这样做是有效的

>>> mitch = Person('mitch')
>>> mitch.greet('mitchell') # prints 'Hi mitchell, my name is mitch'
>>> mitch.name # prints 'mitch'
>>> mitch.other_name # prints 'mitchell'