school-student.py

import json

class School:
    def __init__(self, name):
        self.name = name
        self.students = []

    def to_dict(self):
        return {
            'name': self.name,
            'students': map(Student.to_dict, self.students),
        }

    def from_dict(self, input_dict):
        self.name = input_dict['name']        
        self.students = map(Student.from_dict, input_dict['students'])

    def save(self, file_path='database.json'):
        with open(file_path, 'w') as file_handler:
            file_handler.write(json.dumps(self.to_dict(), indent=4))

    def load(self, file_path='database.json'):
        with open(file_path, 'r') as file_handler:
            dictionary = json.load(file_handler)

        self.from_dict(dictionary)

    def find_student(self, student):
        for i, std in enumerate(self.students):
            if std.national_id == student.national_id:
                return i
        return -1

    def add_student(self, student):
        index = self.find_student(student)
        if index != -1:
            return
        self.students.append(student)

    def remove_student(self, student):
        index = self.find_student(student)
        if index == -1:
            return
        self.students.pop(index)


class Student:
    max_age = 18

    def __init__(self, first_name, last_name, national_id, birth_year=''):
        self.first_name = first_name
        self.last_name = last_name
        self.national_id = national_id
        self.birth_year = birth_year
        self.lessons = []

    @staticmethod
    def from_dict(dict_input):        
        std = Student(
            first_name = dict_input['first_name'],
            last_name = dict_input['last_name'],
            national_id = dict_input['national_id']
        )
        std.birth_year = dict_input['birth_year']
        std.lessons = dict_input['lessons']
        return std

    def to_dict(self):
        return {
            'first_name': self.first_name,
            'last_name': self.last_name,
            'national_id': self.national_id,
            'birth_year': self.birth_year,
            'lessons': self.lessons,
        }

    def add_lesson(self, name, score):
        index = self.find_lesson(name)
        if index != -1:
            return
        self.lessons.append({
            'name': name,
            'score': score
        })

    def find_lesson(self, name):
        for i in range(len(self.lessons)):
            lesson = self.lessons[i]
            if lesson['name'] == name:
                return i
        return -1

    def remove_lesson(self, name):
        index = self.find_lesson(name)
        if index == -1:
            return
        self.lessons.pop(index)

    def edit_lesson(self, name, score):
        index = self.find_lesson(name)
        if index == -1:
            return
        self.lessons[index]['score'] = score


if __name__ == "__main__":
    school = School(name='anghezi')
    school.load()

    yaro_index = school.find_student(Student(first_name='', last_name='', national_id=84511))
    if yaro_index == -1:
        print('yaro not found')
        exit(1)
    mamadreza_zibaei = school.students[yaro_index]
    mamadreza_zibaei.add_lesson('varzesh', 10)
    school.students[yaro_index] = mamadreza_zibaei

    amirreza = Student(
        first_name = 'amirreza',
        last_name = 'moeini',
        national_id = 18784
    )
    
    school.add_student(amirreza)
    school.save()