python - 为什么我会收到 TypeError？

Question

我的这个程序的目标是记录 4 条信息(员工编号、员工姓名、类次编号和小时工资率)，然后显示它们。我需要在这个程序中使用类。

这是类代码:

class Employee(object):

    def __init__(self, name, number):
        self.__name = name
        self.__number - number

    def set_name(self, name):
        self.__name = name

    def set_number(self, number):
        self.__number = number

    def get_name(self):
        return self.__name

    def get_number(self):
        return self.__number

class ProductionWorker(Employee):

    def __init__(self, name, number,
                 shift, payRate):

        Employee.__init__(self, name, number)

        self.__shift = shift
        self.__payRate = payRate

    def set_shift(self, shift):
        self.__shift = shift

    def set_payRate(self, payRate):
        self.__payRate = payRate

    def get_shift(self):
        return self.__shift

    def get_payRate(self):
        return self.__payRate

下面是导入类代码并执行的代码:

import employee

name = input('Name: ')
number = input('Employee Number: ')
shift = input('Shift number (Enter 1 for day and 2 for night): ')
payRate = input('Hourly Pay Rate: ')

myEmployee = employee.ProductionWorker(name, number,
                           shift, payRate)

print('--------------------')
print('Employee Information')
print('--------------------')
print('Name:', myEmployee.get_name())
print('Employee Number:', myEmployee.get_number())
print('Customer number:', myEmployee.get_Shift())
print('Hourly Pay Rate:', myEmployee.get_payRate())

好的，固定类型:

myEmployee = employee.Employee(name, number,
                           shift, payRate)

到:

myEmployee = employee.ProductionWorker(name, number,
                           shift, payRate)

但现在我收到了这个错误:

Traceback (most recent call last):
      File "C:/Users/Alex/Desktop/Programming Concepts/Homework 2/Chapter 13/Employee and Production Worker Class.py", line 9, in <module>
        shift, payRate)
      File "C:/Users/Alex/Desktop/Programming Concepts/Homework 2/Chapter 13\employee.py", line 24, in __init__
        Employee.__init__(self, name, number)
      File "C:/Users/Alex/Desktop/Programming Concepts/Homework 2/Chapter 13\employee.py", line 5, in __init__
        self.__number - number
    AttributeError: 'ProductionWorker' object has no attribute '_Employee__number'

再次感谢您的帮助!

Answer 1

改变

myEmployee = employee.Employee(name, number,
                       shift, payRate)

到

myEmployee = employee.ProductionWorker(name, number,
                       shift, payRate)

还有一个建议:写getters和setters一般是frowned upon in Python .只需将成员公开并获取/设置它们:

myEmployee.name = "David"
print myEmployee.name