practical9.py

# Name : PRATHAM MODI
# ID : 20CE056
# Aim :  Consider an example of declaring the examination result. Design three classes: Student, Exam, and Result. The Student class has data members such as those representing rollNumber, Name, etc. Create the class Exam by inheriting Student class. The Exam class adds fields representing the marks scored in six subjects. Derive Result from the Exam class, and it has its own fields such as total_marks. Write an interactive program to model this relationship.
# GITHUB LINK : https://github.com/prathammodi333/python-programs



class Student:

    name = "NAME"
    age = 18
    gender = "MALE"
    roll_no = 56


    def __init__(self, name, age, gender):
        self.name = name
        self.age = age
        self.gender = gender

    def set_roll_no(self, roll_no):
        self.roll_no = roll_no


class Exam(Student):

    sub_list = []
    total_subjects = 6
    marks_of_student = {}

    __marks_criteria = 100

    __gotMarks = False  

    def __init__(self, name, age, gender, sub_length):
        super().__init__(name, age, gender)  
        self.total_subjects = sub_length
        for i in range(self.total_subjects):
            sub_name = input(f"Enter name of the subject {i + 1} : ")
            self.sub_list.append(sub_name)

    def show_subject_list(self):  
        print("The subjects are : ")
        for subject in self.sub_list:
            print(subject)

    def change_subject_list(self): 
        confirmation = input("Are you sure you want to change the subjects? (y/n) : ")
        if 'y' in confirmation or 'Y' in confirmation:
            print("Enter all the subject's name again!")
            for i in range(self.total_subjects):
                self.sub_list.append(input("Enter subject name : "))
            print("All subject's name changed successfully!")
        else:
            print("Operation cancelled successfully!")
        self.__gotMarks = False

    def alter_subjects(self, start, end):
        if start <= 0 or end > self.total_subjects:
            print("There is some error in arguments passed for alteration!")
        else:
            for i in range(start, end + 1):
                self.sub_list.pop(i - 1)
                self.sub_list.insert(i - 1, input(f"Enter name of the subject {i} : "))
        self.__gotMarks = False

    def alter_subject(self, index):
        self.alter_subjects(index, index)

    def __getMarks(self):
        self.marks_of_student.clear()  
        for subject in self.sub_list:  
            marks = int(input(f"Enter marks for {subject} : "))
            if marks < 0 or (marks > self.__marks_criteria):
                print("Error in marks...entered...!")
                return
            else:
                self.marks_of_student.update({subject: marks})
        self.__gotMarks = True

    def grab_marks(self):  
        if self.__gotMarks:
            confirmation = input("""Are you sure you want to grab the marks again, because the subjects are neither 
            changed nor altered! (y/n) : """)
            if 'y' in confirmation or 'Y' in confirmation:
                self.__getMarks()
            else:
                print("Operation of getting new Mark-sheet has been cancelled!")
        else:
            self.__getMarks()

    def change_marks_criteria(self, max_marks):
        self.__marks_criteria = max_marks

    def show_marks_criteria(self):
        print(self.__marks_criteria)

    def get_marks_criteria(self):
        return self.__marks_criteria


class Result:


    exam = ""
    passing_criteria = 100  
    grade_list = {"A": 90, "B": 80, "C": 60, "D": 50} 

    def __init__(self, exam):
        self.exam = exam
        self.passing_criteria = (exam.get_marks_criteria() * exam.total_subjects) * 0.5


    def __getGrade(self, marks):
        for grades in self.grade_list.keys():
            if marks >= self.grade_list.get(grades):
                return grades
        return "Fail"


    def show_mark_sheet(self):
        if len(self.exam.marks_of_student) == self.exam.total_subjects:

            print(f"*************Mark-sheet of {self.exam.name}******************")
            print(f"Roll no : {self.exam.roll_no}")
            for subject in self.exam.marks_of_student.keys():
                print(f"Marks in {subject} : ", self.exam.marks_of_student.get(subject), "#Grade : ",
                      self.__getGrade(self.exam.marks_of_student.get(subject)))
            print(f"Total marks : {sum(self.exam.marks_of_student.values())}/{self.exam.total_subjects * self.exam.get_marks_criteria()}")
            print(f"Overall Grade : {self.__getGrade(sum(self.exam.marks_of_student.values())/self.exam.total_subjects)}")
        else:
            print("Marks has not been updated")


if __name__ == "__main__":
    ExamA = Exam("Pratham Modi", 18, "MALE", 4)
    ResultA = Result(ExamA)
    ResultA.exam.grab_marks()
    ResultA.show_mark_sheet()