Untitled

import csv
import os
import ast



students = {}
data_file = 'students.csv'


PREDEFINED_SUBJECTS = [
    "Mathematics",
    "Physics",
    "Chemistry",
    "Biology",
    "History",
    "Geography",
    "Computer Science",
    "English Language",
    "Philosophy",
    "Sociology"
]



def load_students():

    if not os.path.exists(data_file):
        return

    with open(data_file, mode='r', newline='') as file:
        reader = csv.DictReader(file)
        for row in reader:
            student_id = int(row['id'])

            grades = ast.literal_eval(row['grades']) if row['grades'] else {}

            students[student_id] = {
                'first_name': row['first_name'],
                'last_name': row['last_name'],
                'school_class': row['school_class'],
                'address': row['address'],
                'date_of_birth': row['date_of_birth'],
                'contact': row['contact'],
                'grades': grades
            }


def save_students():

    with open(data_file, mode='w', newline='') as file:
        fieldnames = ['id', 'first_name', 'last_name', 'school_class', 'address', 'date_of_birth', 'contact', 'grades']
        writer = csv.DictWriter(file, fieldnames=fieldnames)
        writer.writeheader()
        for student_id, student in students.items():

            student['grades'] = str(student['grades'])
            writer.writerow({
                'id': student_id,
                'first_name': student['first_name'],
                'last_name': student['last_name'],
                'school_class': student['school_class'],
                'address': student['address'],
                'date_of_birth': student['date_of_birth'],
                'contact': student['contact'],
                'grades': student['grades']
            })

def add_student_to_file(student):

    with open(data_file, mode='a', newline='') as file:
        fieldnames = ['id', 'first_name', 'last_name', 'school_class', 'address', 'date_of_birth', 'contact', 'grades']
        writer = csv.DictWriter(file, fieldnames=fieldnames)
        writer.writerow({
            'id': student['id'],
            'first_name': student['first_name'],
            'last_name': student['last_name'],
            'school_class': student['school_class'],
            'address': student['address'],
            'date_of_birth': student['date_of_birth'],
            'contact': student['contact'],
            'grades': str(student['grades'])
        })


def add_student_interactive():

    while True:
        student_id = input("Enter student ID: ")

        if not student_id.isdigit():
            print("Student ID must be a number.")
            continue

        student_id = int(student_id)

        if student_id in students:
            print(f"A student with ID {student_id} already exists. Please enter a different ID.")
            continue


        break


    first_name = input("Enter student's first name: ").capitalize()
    last_name = input("Enter student's last name: ").capitalize()
    school_class = input("Enter student's class (e.g., Grade 10): ")
    address = input("Enter student's address: ")
    date_of_birth = input("Enter student's date of birth (YYYY-MM-DD): ")
    contact = input("Enter student's contact number: ")


    grades = {}


    for subject in PREDEFINED_SUBJECTS:
        while True:
            grade_input = input(f"Enter grade for {subject} (or type 'skip' to leave blank): ")

            if grade_input.strip().lower() == 'skip':
                grades[subject] = None
                break
            try:
                grade = int(grade_input)
                if grade < 1 or grade > 10:
                    print("Invalid grade. Please enter a grade between 1 and 10.")
                else:
                    grades[subject] = grade
                    break
            except ValueError:  # This catches non-integer inputs
                print("Invalid grade. Please enter a whole number for the grade, or type 'skip' to leave blank.")



    student = {
        'id': student_id,
        'first_name': first_name,
        'last_name': last_name,
        'school_class': school_class,
        'address': address,
        'date_of_birth': date_of_birth,
        'contact': contact,
        'grades': grades
    }


    students[student_id] = student

    print(f"Added student: ID: {student_id}, Name: {first_name} {last_name}, Grades: {grades}")
    add_student_to_file(student)


def update_grades():
    student_id = int(input("Enter student ID to update: "))
    subject = input("Enter subject for which to update the grade: ").strip()


    if subject not in PREDEFINED_SUBJECTS:
        print(f"Invalid subject: '{subject}'. Please check your spelling.")
        print(f"Available subjects: {', '.join(PREDEFINED_SUBJECTS)}")
        return


    if student_id not in students:
        print(f"Student with ID {student_id} not found.")
        return

    student = students[student_id]


    if subject in student['grades']:
        try:
            new_grade = int(input(f"Enter new grade for {subject}: "))
            if 1 <= new_grade <= 10:
                student['grades'][subject] = new_grade
                print(f"Updated {student['first_name']} {student['last_name']}'s grade for {subject} to: {new_grade}")
                save_students()
            else:
                print("Invalid grade. Please enter a grade between 0 and 10.")
        except ValueError:
            print("Invalid input. Please enter a valid number for the grade.")
    else:
        print(f"No grade found for subject: {subject}")


def view_students():

    if not students:
        print("No students available.")
        return

    print("\nStudents List:")
    print("-" * 40)
    for student_id, student in students.items():
        print(f"ID: {student_id}, Name: {student['first_name']} {student['last_name']}, Class: {student['school_class']}")
        print(f"  Address: {student['address']}, Date of Birth: {student['date_of_birth']}, Contact: {student['contact']}")


        if isinstance(student['grades'], dict):
            for subject, grade in student['grades'].items():
                print(f"  {subject}: {grade}")
        else:
            print("  Grades data is corrupted. Expected dictionary, but found:", type(student['grades']))

        print("-" * 40)



def delete_student():

    student_id = int(input("Enter student ID to delete: "))

    if student_id in students:
        del students[student_id]
        print(f"Deleted student with ID: {student_id}")
        save_students()
    else:
        print(f"Student with ID {student_id} not found.")


load_students()


add_student_interactive()
update_grades()
view_students()
delete_student()