Question

2. Create two class, a student class, and a course class, take advantage of the codes provided in the class slides and sample codes. python

Student	Course
__Username:str __Courses:list	__courseName:str __students: list
addCourse():None dropCourse():None getCourse():list	addStudent:None dropStudent:None getStudents():list getNumber of students:int

3. Create a student object for every student in the UD.txt (you can use a loop for this)

4. Create 6 course objects:

1. CS131 2. CS132 3. EE210 4. EE310 5. Math320 6. Math220

5. After the student user login to their account as we have done in lab 2. Display the following:

A: Show all courses available B: Add a course C: Drop a course D: Show all my courses E: Exit

When students choose option A, should display the following, where # is the actual number of students enrolled in the class.

1. CS131                                         students number:# 2. CS132                                         students number:# 3. EE210                                         students number:# 4. EE310                                         students number:# 5. Math 320                                   students number:# 6. Math 220                                   students number:#

Let the students add or drop a classes as they wish. When they choose E, exit the program.

6. For option D, show the courses in the student’s course list.

7. The hard part. Since your program will end when user chose option E. You need to keep track the classes been added and dropped by each students, and who are actually in the classes. Therefore, based on your experiences in lab 3 and 4, create a SI.txt (student info) to store the courses in each student’s course list. Create CI.txt (course info) to store all the students enrolled in each course. This will be executed in the background every time when the user chose option E: Exit. When you run your program, and create your course objects, this information needs to be read into each student and course object. When a student log into his or her account, the student should be able to see what courses is in the course list by chose option D. The number of students in each course also need to be displayed in Option A.

Student info

UD.txt

USERNAME,PASSWORD
sdd233,Pad231
dcf987, BHYW4fw
dgr803,Sb83d2d
mkr212,UNNHS322
lki065,dgw6234
ped332,9891ds
ytr876,dsid21kk
nmh223,3282jd3d2

Answer 1

thanks for the question, here is the fully implemented code in python. All functions are commented so that you can understand what each function does. Let me know in case you have any doubts or questions.

======================================================================================

# student class starts here
class Student():
    def __init__(self,user_name=''):
        self.__username=user_name
        self.__courses=[]
    def addCourse(self,course):
        self.__courses.append(course)
    def dropCourse(self,course_name):
        for course in self.__courses:
            if course.getCourseName()==course_name:
                self.__courses.remove(course)
                print('Course successfully deleted')
                return
    def getCourse(self):return self.__courses
    def getUserID(self):return self.__username

# Course class starts here
class Course():
    def __init__(self,course_name=''):
        self.__coursename=course_name
        self.__students=[]
    def addStudent(self,student):
        self.__students.append(student)
    def dropStudent(self,id):
        for student in self.__students:
            if student.getUserID()==id:
               self.__students.remove(student)
                print('Student successfully deleted')
                return
    def getStudents(self):return self.__students
    def getNumberOfStudents(self):return len(self.__students)
    def getCourseName(self):return self.__coursename

# read from the UD.txt file all the ids and password and returns as a dictionary
def readStudentIDPwdFromFile(filename):
    user_id_dict={}
    with open(filename,'r') as infile:
        for line in infile.readlines():
            line = line.strip().split(',')
            user_id_dict[line[0].strip()]=line[1].strip()
    return user_id_dict

# function which ask user to enter id and password and returns True if id password matches
# else it returns false if the id dont exist or the password dont match
def login(student_id_password):
    id=input('Enter user id to login: ')
    password = input('Enter password: ')
    if student_id_password.get(id) is None:return False
    return student_id_password.get(id)==password
# display menu and ask user to enter a choice adn returns the choice back to main function
def display_menu():
    print('A: Show all courses available')
    print('B: Add a course')
    print('C: Drop a course')
    print('D: Show all my courses')
    print('E: Exit')
    choice=input('Enter choice: ')
    return choice

# displays all the courses the student is enrolled to
def displayAllCourses(courses):
    for i in range(len(courses)):
        print('{0}. {1} students number: {2}'.format(i+1,courses[i].getCourseName(),courses[i].getNumberOfStudents()))

# function to add a course to the student object courses list
def addCourse(student_Id, students, courses):
    course_name= input('Enter course name: ')
    for student in students:
        if student.getUserID()==student_Id:
            for course in courses:
                if course.getCourseName()==course_name:
                    student.addCourse(course)
                    print('Course successfully added')
                    return
            print('Course not available.')
            return

# function to remove a course from the student courses list
def dropCourse(student_Id, students, courses):
    course_name= input('Enter course name: ')
    for student in students:
        if student.getUserID()==student_Id:
            for course in courses:
                if course.getCourseName()==course_name:
                    student.dropCourse(course_name)
                    return
            print('Course not available.')
            return

# show all the courses for the students
def showAllCourses(student_Id, students):
    for student in students:
        if student.getUserID()==student_Id:
            courses = student.getCourse()
            for course in courses:
                print('Course Enrolled to: {}'.format(course.getCourseName()))

# driver function
def main():
    # reads the UD.txt file
    student_id_password=readStudentIDPwdFromFile('D:\\UD.txt')
    # contains all the student objects in a list
    students=[]
    for student_Id in student_id_password.keys():
        students.append(Student(student_Id))
    # contain all the courses object as a list
    courses=[]
    courses.append(Course('CS131'))
    courses.append(Course('CS132'))
    courses.append(Course('EE210'))
    courses.append(Course('EE310'))
    courses.append(Course('Math320'))
    courses.append(Course('Math220'))
    if login(student_id_password) is not True:
        print('Invalid login id/password entered. Program will terminate now.')
        return
    while True:
        choice=display_menu().upper()
        if choice=='A': displayAllCourses(courses)
        elif choice=='B':addCourse(student_Id,students,courses)
        elif choice=='C':dropCourse(student_Id,students,courses)
        elif choice=='D':showAllCourses(student_Id,students)
        elif choice=='E':
            print('Thanks for using the program')
            break



main()