LU02.L11 - Immutable Dataclass

student.py

"""
The Student class is a dataclass that represents a student
with a name, grades, and a graduation status.
"""
from dataclasses import dataclass, field
from typing import List
 
@dataclass(frozen=True)
class Student:
    """
    A class representing a student with a name, grades, and a graduation status.
    """
    name: str
    grades: List[int] = field(default_factory=list)
    graduated: bool = False

main.py

"""
This is the main module of the application.
"""
from student import Student
 
def add_grade(student, grade):
    """
    Returns a new Student instance with the added grade.
    """
    new_grades = student.grades + [grade]
    return Student(name=student.name, grades=new_grades, graduated=student.graduated)
 
def calculate_average(student):
    """
    Returns the average of the student's grades.
    """
    if not student.grades:
        return 0.0
    return round(sum(student.grades) / len(student.grades),2)
 
def graduate_student(student):
    """
    Graduates the student if the average grade is 70 or above.
    """
    average = calculate_average(student)
    if average >= 70:
        return Student(name=student.name, grades=student.grades, graduated=True)
    return student
 
if __name__ == '__main__':
    stu = Student(name='John Doe')
    stu = add_grade(stu, 85)
    stu = add_grade(stu, 75)
    stu = add_grade(stu, 60)
 
    print(f'Noten: {stu.grades}')
    avg = calculate_average(stu)
    print(f'Durchschnitt: {avg}')
 
    stu = graduate_student(stu)
    print(f'Absolviert: {stu.graduated}')