错误的结果打印到控制台

Question

我有以下代码，应该将 3500.0 打印到控制台：

class Employee:
    
    """ Creates an instance of Employee """
    
    def __init__(self, name, annual_salary):
        self.name = name
        self.annual_salary = annual_salary
        
    def calculate_monthly_salary(self):
        return annual_salary / 0.12
        

class CustomerServiceEmployee(Employee):
    
    """ Creates an instance of CustomerServiceEmployee """
    
    def __init__(self, name, annual_salary, department):
        super().__init__(name, annual_salary)
        self.department = department

cs_manager = CustomerServiceEmployee("Kelly Johnson", 42000, "Customer Service")
kellys_monthly_salary = Employee.calculate_monthly_salary
print(kellys_monthly_salary)

但它会打印：

<function Employee.calculate_monthly_salary at 0x7fdfb1db31f0>

我被引导相信我的问题出在方法 calculate_monthly_salary 但我终其一生都无法解决。有没有人能解释一下？

Answer 1

首先，您已经为CustomerServiceEmployee 创建了一个对象并将其存储在cs_manager 中。那为什么不使用呢？

kellys_monthly_salary = cs_manager.calculate_monthly_salary()

line 10 也应该有 self。

self.annual_salary 

完整代码

class Employee:
    
    """ Creates an instance of Employee """
    
    def __init__(self, name, annual_salary):
        self.name = name
        self.annual_salary = annual_salary
        
    def calculate_monthly_salary(self):
        return self.annual_salary / 0.12
        

class CustomerServiceEmployee(Employee):
    
    """ Creates an instance of CustomerServiceEmployee """
    
    def __init__(self, name, annual_salary, department):
        super().__init__(name, annual_salary)
        self.department = department

cs_manager = CustomerServiceEmployee("Kelly Johnson", 42000, "Customer Service")
kellys_monthly_salary = cs_manager.calculate_monthly_salary()
print(kellys_monthly_salary)