Erreur de type lors du découplage de students.dat

Question

Je vais rester bref. J'ai un fichier de classe Python et un fichier régulier. La classe est étudiante et le but du programme est de pouvoir changer certains attributs, ajouter un étudiant et afficher GPA après vous dans un étudiant. est le fichier du programme ici:

import studentClass 
import pickle 

student = studentClass.Student 
FILENAME = "students.dat" 

LOOK_UP = 1 
ADD = 2 
CHANGE_GPA = 3 
CHANGE_GRADE = 4 
DISPLAY = 5 
QUIT = 6 

#makes Students 
def make_students(): 



    print("Enter data for students") 
    output_file = open(FILENAME, "wb") 
    for count in range(1,2): 

     print("Student " +str(count) + ':') 
     name = input("Enter student Name: ") 
     stuID = int(input("Enter student ID:")) 
     GPA = float(input("Enter GPA: ")) 
     expectGrade = (input("Enter the expected grade: ")) 
     fTime_pTime = input("Is the student full-time or part-time: ") 

     student(name,stuID, GPA, expectGrade, fTime_pTime) 

     pickle.dump(student, output_file) 

    output_file.close() 

    main() 

#Shows GPA of student 
def showGPA(students): 
    name = input("enter a name: ") 

    if name in students: 
     entry = student.get_GPA() 
     print(entry) 

#adds and student 

def add(students): 

    name = input("Enter student Name: ") 
    stuID = int(input("Enter student ID:")) 
    GPA = float(input("Enter GPA: ")) 
    expectGrade = (input("Enter the expected grade: ")) 
    fTime_pTime = input("Is the student full-time or part-time: ") 

    entry = student(name,stuID, GPA, expectGrade, fTime_pTime) 

    if name not in students: 
     students[name] = entry 
     print('Entry has been added') 
    else: 
     print('That name is taken') 



#Changes GPA 
def changeGPA(students): 
    name = input("Enter a name: ") 

    if name in students: 
     GPA = input("enter a new GPA") 

     entry = student.set_GPA(GPA) 

     students[name] = entry 
     print("Info updated") 

    else: 
     print("That name was not found") 


#Changes expected grade 
def changeEX(students): 
    name = input("Enter a name: ") 

    if name in students: 
     expectGrade = input("enter a new GPA") 

     entry = student.set_expectGrade(expectGrade) 

     students[name] = entry 
     print("Info updated") 

    else: 
     print("That name was not found") 


#Saves changes 
def save_students(student): 

    output_file = open(FILENAME, 'wb') 

    pickle.dump(student, output_file) 

    output_file.close() 


#Displays list of students 
def display_list(student_list): 
    for item in student_list: 
     print(item.get_name()) 
     print(item.get_stuID()) 
     print(item.get_GPA) 
     print(item.get_expectGrade) 
     print(item.get_fulltime) 

#Loads the students.dat 
def load_students(): 
    try: 
     input_file = open(FILENAME, 'rb') 

     student_dct = pickle.load(input_file) 

     input_file.close() 

    except IOError: 

     student_dct = {} 

    return student_dct 

def make_menu(): 
    print("1. Look up Students GPA.") 
    print("2. Add a new student.") 
    print("3. Change GPA for a student.") 
    print("4. Change expected grade of a student") 
    print("5. Display all student.") 
    print("6. Quit Program.") 
    choice = int(input("Enter your choice: ")) 

    while choice < LOOK_UP or choice > QUIT: 
     choice = int(input("Enter a vaild choice: ")) 

    return choice 

def main(): 

    #pickle_student.main() 
    #make_students() 

    studentObjs = load_students() 
    choice = make_menu() 

    while choice != QUIT: 

     if choice == LOOK_UP: 
      showGPA(studentObjs) 
     elif choice == ADD: 
      add(studentObjs) 
     elif choice == CHANGE_GPA: 
      changeGPA(studentObjs) 
     elif choice == CHANGE_GRADE: 
      changeEX(studentObjs) 
     elif choice == DISPLAY: 
      display_list(studentObjs) 

    save_students(studentObjs) 


#runs program 
make_students() 

ET ... le fichier de classe

__author__ = 'MichaelCorbett' 

class Student: 

    def __init__(self,name,stuID, GPA, expectGrade, fulltime): 

     self.__name = name 
     self.__studID = stuID 
     self.__GPA = GPA 
     self.__expectGrade = expectGrade 
     self.__fulltime = fulltime 


    # Set methods 
    def set_name(self,name): 
     self.__name = name 

    def set_stuID(self, stuID): 
     self.__studID 

    def set_GPA(self, GPA): 
     self.__GPA = GPA 

    def set_expectGrade(self, expectGrade): 
     self.__expectGrade 

    def set_fulltime(self, fulltime): 
     self.__fulltime = fulltime 


    # Get methods 
    def get_name(self): 
     return self.__name 

    def get_stuID(self): 
     return self.__studID 

    def get_GPA(self): 
     return self.__GPA 

    def get_expectGrade(self): 
     return self.__expectGrade 

    def get_fulltime(self): 
     return self.__fulltime 

    def __str__(self): 
     return "Student: " + self.__name + \ 
      "\nStudent ID: " + self.__studID+ \ 
      "\nGPA: "+ self.__GPA+ \ 
      "\nExpected Grade: " + self.__expectGrade+\ 
      "\nFullTime: " + self.__fulltime 

ERREUR:

Traceback (most recent call last): 
    File "/Users/MichaelCorbett/PycharmProjects/lab9/test.py", line 171, in <module> 
    make_students() 
    File "/Users/MichaelCorbett/PycharmProjects/lab9/test.py", line 37, in make_students 
    main() 
    File "/Users/MichaelCorbett/PycharmProjects/lab9/test.py", line 165, in main 
    display_list(studentObjs) 
    File "/Users/MichaelCorbett/PycharmProjects/lab9/test.py", line 110, in display_list 
    for item in student_list: 
TypeError: 'type' object is not iterable 

Answer 1

Dans votre fonction make_students(), ne pas décaper la classe student:

student(name,stuID, GPA, expectGrade, fTime_pTime) 
    pickle.dump(student, output_file) 

Pickle les instances créées:

one_student = student(name,stuID, GPA, expectGrade, fTime_pTime) 
    pickle.dump(one_student, output_file) 

Il est préférable de garder la classe capitalisé:

from studentClass import Student 

maintenant vous pouvez écrire:

student = Student(name,stuID, GPA, expectGrade, fTime_pTime) 
pickle.dump(student, output_file) 

Par classes de convention une majuscule et d'instance sont minuscule. Cela aide à comprendre ce qui se passe.