Refactor Ex.

lib.py

class Person:
    def __init__(self, name):
        self.name = name
        self._address = ""

    def getName(self):
        return self.name

    def getAddress(self):
        return self._address

    def setName(self, name):
        self.name = name

    def setAddress(self):
        return self._address


class GradeRange:
    def __init__(self, minimum, maximum):
        self.minimum = minimum
        self.maximum = maximum


class Course:
    def __init__(self, name, gradeRange, teacher):
        self.name = name
        self.passRequirement = gradeRange
        self.teacher = teacher


class StudentReport:
    def __init__(self):
        self.gradeOfCourse = {}

    def addGrade(self, course, grade):
        if not course.name in self.gradeOfCourse.keys():
            self.gradeOfCourse.update({
                course.name : grade
            })
        else:
            self.gradeOfCourse[course.name] += grade

    def removeGrade(self, course, grade):
        if not course.name in self.gradeOfCourse.keys():
            return
        else:
            self.gradeOfCourse[course.name] -= grade

    def getAverage(self):
        return sum(self.gradeOfCourse.values()) / len(self.gradeOfCourse.values())


class Student(Person):
    def __init__(self, name):
        super().__init__(name)
        self.report = StudentReport()

    def enroll(self, course):
        self.report.addGrade(course, 0)

    def cancelCourse(self, course):
        del self.report.gradeOfCourse[course.name]

    def isPass(self, course):
        return self.report.gradeOfCourse[course.name] > course.passRequirement.minimum


class Teacher(Person):
    def __init__(self, name):
        super().__init__(name)

main.py

from lib import *

if __name__ == "__main__":
    teacher = Teacher("Alwin")
    courses = [
            Course("Programming", 
                GradeRange(1, 4),
                teacher
            ),
            Course("GameDesign",
                GradeRange(1, 4),
                teacher
            ),
            Course("GameArt",
                GradeRange(1, 4),
                teacher
            ),
            Course("Linux",
                GradeRange(1, 4),
                teacher
            )
    ]

    student = Student("CSaratakij")

    print("______________________________")
    print("All Course : ")
    print("______________________________")

    for course in courses:
        print(course.name, " : ", course.teacher.name)

    print("______________________________")

    print(student.name, " : ", "Enrolling..")
    print("______________________________")

    for course in courses:
        student.enroll(course)
        print(course.name)

    print("______________________________")

    student.report.addGrade(courses[0], 3.8)
    student.report.addGrade(courses[1], 3.0)
    student.report.addGrade(courses[2], 3.0)
    student.report.addGrade(courses[3], 4.0)

    print("Student Average")
    print("______________________________")
    print(student.report.getAverage())

    print("______________________________")
    print("Is pass at Programming")
    print("______________________________")
    print(student.isPass(courses[0]))
    print("______________________________")