python - 尝试从不同的文件调用对象，但输出仅显示空白

Question

作为作业，我制作了一个员工类(class)文件。然后我制作了一个单独的程序，它有一个菜单，用户可以从中添加、编辑、显示员工文件的内容。但是，当我尝试显示时，唯一的输出是空白。

员工.py:

class Employee:
    def __init__(self, name, emplpoyeeid, department, job_title):
        self.__name = ""
        self.__employeeid = ""
        self.__department = ""
        self.__job_title = ""

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

    def set_id(self, employeeid):
        self.__employeeid = employeeid

    def set_department(self, department):
        self.__department = department

    def set_job_title(self, job_title):
        self.__job_title = job_title

    def get_name(self):
        return self.__name

    def get_employeeid(self):
        return self.__employeeid

    def get_department(self):
        return self.__department

    def get_job_title(self):
        return self.__job_title

实际的程序文件:

import pickle
from Employee import Employee

try:
    filename=open('Employee.dat','rb')

    dictionary=pickle.load(filename)

except:
    dictionary={}

while True:
    print('\n1. Look up an employee in the dictionary')
    print('2. Add a new employee in the dictionary')
    print("3. Change an existing employee's name,department and job title in the dictionary")
    print('4. Delete an employee from the dicionary')
    print('5. Quit the program\n')

    choice=input('\nEnter a choice: ')

    if choice == '1':
        while True:
            employeeid=input('\nEnter the ID of the employee: ')

            if employeeid in dictionary:

                    ob=dictionary[employeeid]

                    print('Employee Name: ',ob.get_name())
                    print('Employee ID: ',ob.get_employeeid())
                    print('Employee department: ',ob.get_department())
                    print('Employee job title: ',ob.get_job_title())
                    break


            else:
                    print('\nEmployee not found \n')
                    break



    elif choice== '2':   
        while True:
            name=input('\nEnter the name of the employee: ')

            employeeid=input('\nEnter the employee id: ')

            dept=input('\nEnter the employee department: ')

            title=input('\nEnter the employee job title: ')

            ob=Employee(name,employeeid,dept,title)

            dictionary[employeeid]=ob

            print("employee has been added")
            break


    elif choice== '3':
        while True:
            employeeid=input('\nEnter the employee ID to change the details: ')

            if employeeid in dictionary:

                    ob=dictionary[employeeid]

                    while True:          

                        name=input('\nEnter the new name of the employee: ')

                        ob.set_name(name)

                        dept=input('\nEnter the new department of the employee: ')

                        ob.set_department(dept)

                        title=input('\nEnter the new job title of the employee: ')

                        ob.set_job_title(title)

                        break

            else:

                print('\nID not found \n')



    elif choice == '4':
        while True:
            employeeid=input('\nEnter the ID of the employee to delete: ')

            if employeeid in dictionary:
                    del dictionary[employeeid]
                    print('\nEmployee data removed \n ')
            else:
                    print("Employee data not found")

    elif choice == '5':

        filename=open('Employee.dat','wb')
        pickle.dump(dictionary,filename)
        filename.close()

    else:
        print('\nPlease enter a valid choice ')

1. Look up an employee in the dictionary
2. Add a new employee in the dictionary
3. Change an existing employee's name,department and job title in the dictionary
4. Delete an employee from the dicionary
5. Quit the program

Enter a choice: 2

Enter the name of the employee: sam

Enter the employee id: 1

Enter the employee department: 2

Enter the employee job title: 3 employee has been added

1. Look up an employee in the dictionary
2. Add a new employee in the dictionary
3. Change an existing employee's name,department and job title in the dictionary
4. Delete an employee from the dicionary
5. Quit the program 4

Enter a choice: 1

Enter the ID of the employee: 1 Employee Name: Employee ID:
Employee department: Employee job title:

1. Look up an employee in the dictionary
2. Add a new employee in the dictionary
3. Change an existing employee's name,department and job title in the dictionary
4. Delete an employee from the dicionary
5. Quit the program

Enter a choice:

我期望最初输入的值位于第二个输出中 但它只显示空白

Answer 1

首先:您的Employee导入不正确。如果您的文件名是employee.py，您应该编写:

从员工导入员工

因为您的程序找不到名为 Employee.py 的文件。

第二:尽量不要使用while True。它很容易让你的程序陷入无限循环。例如:如果您选择第四个选项 - 从字典中删除员工 - 您将永远不会返回主菜单，因为您无法打破无限循环。

第三:您的Employee.__init__创建空字段:

class Employee:
    def __init__(self, name, emplpoyeeid, department, job_title):
        self.__name = ""
        self.__employeeid = ""
        self.__department = ""
        self.__job_title = ""

并且您在主模块中没有使用任何 setter 。当然，它会为每个字段返回空字符串。将 setter 添加到主模块或将 employee.py 更改为:

class Employee:
    def __init__(self, name, emplpoyeeid, department, job_title):
        self.__name = name
        self.__employeeid = emplpoyeeid
        self.__department = department
        self.__job_title = job_title