Python 3.5.2名称

Question

我已经声明了我的类Customer，并试图从类实例中提取数据，我的方法get_place_in_queue工作正常，但当我运行get_nr_errands时，它出现了以下错误：

"name 'nr_errands' is not defined"

到目前为止我的代码是：

class Customer:
    def __init__(self,index_number,place_in_queue,nr_errands):
        self.index_number=index_number
        self.place_in_queue=place_in_queue
        self.nr_errands=nr_errands

    def get_place_in_queue(self):
        return place_in_queue

    def get_index_number(self):
        return index_number

    def get_nr_errands(self):
        return nr_errands
test=Customer(2,4,5)
test.get_nr_errands()

Answer 1

您忘记了使用self来访问实例变量。您需要：

class Customer:
    def __init__(self,index_number,place_in_queue,nr_errands):
        self.index_number=index_number
        self.place_in_queue=place_in_queue
        self.nr_errands=nr_errands

    def get_place_in_queue(self):
        return self.place_in_queue # <  here

    def get_index_number(self):
        return self.index_number  # <  here

    def get_nr_errands(self):
        return self.nr_errands  # <  here