Student class

Implement a Student, School, and a City classes like so:

• Student, School, and City have a name attribute, given at initialization time.
• A Student have an add_exam(grade) method, recording a new grade for him, as a float.
• A School have an add_student(student) method.
• A City have an add_school(school) method.
• Student, School, and City have a get_mean() method giving:
• For the Student, the average of its results.
• For the School, the average of the students averages.
• For the City the average of the School averages.
• School have a get_best_student() method, returning the best Student.
• Cities have a get_best_school() and a get_best_student() methods, returning respectively a School and a Student..

Example

paris = City('paris')
hkis = School('hkis')
paris.add_school(hkis)
for student_name, student_grades in (('alice', (1, 2, 3)),
                                    ('bob', (2, 3, 4)),
                                    ('catherine', (3, 4, 5)),
                                    ('daniel', (4, 5, 6))):
    student = Student(student_name)
    for grade in student_grades:
        student.add_exam(grade)
    hkis.add_student(student)
print(paris.get_best_school().name)
print(paris.get_best_student().name)

References

• Classes: https://docs.python.org/3/tutorial/classes.html