'''lecture_29_csstudent.py
Show inheritance with the CSStudent (child class) that inherits from ColbyStudent (parent class)

TODO:
1. is-a relationship
2. CSStudent constructor signature: def __init__(self, name, year, favLang)
    - Show with redundant code.
    - Code reuse: call parent constructor (with super() and directly)
3. When instance variables in parent inherited by child
    - Show __init__ with/without calling parent constructor
4. set/get methods for CSStudent-specific vars
    - Show access with ColbyStudent and CSStudent objects
5. Write printGrades in parent (100 point scale)
    - Show OVERRIDE in child (30 point scale)
    - Show EXTENDING in (both scales)
6. Symbol table for `newCSStudent.printGrades()` and `newColbyStudent.printGrades()`
Oliver W. Layton
CS 151: Computational Thinking: Visual Media
Fall 2020
'''


class ColbyStudent:
    lastDayOfClass = 'Dec 4'

    def __init__(self, name, year=2022):
        # Initialization data
        self.name = name
        self.year = year

        # Derived data
        self.grades = []
        self.gpa = 0.0

    def getName(self):
        return self.name

    def getGrades(self):
        # return self.grades  # shallow copy / nickname
        return self.grades[:]  # deep copy by independence rule for slicing lists

    def addGrade(self, newGrade):
        self.grades.append(newGrade)

    def getLastDay(self):
        return ColbyStudent.lastDayOfClass


class CSStudent(ColbyStudent):
    def __init__(self, name, year, favLang):
        # Leveraging/running code in parent class
        # Parent class has another name: super class
        # Child is called subclass
        super().__init__(name, year)  # self.name and self.year get defined
        # Another way to access parent version of a method:
        # ColbyStudent.__init__(self, name, year)
        self.favLang = favLang
        # If super class init not called, self.gpa never defined so following
        # line of code will crash

        print('GPA is', self.gpa)

        print('Accessing getFavLang method:', self.getFavLang())

        # Duplicated code from parent class
        # self.name = name
        # self.year = year
        # self.favLang = favLang

    def getFavLang(self):
        return self.favLang


if __name__ == '__main__':
    colbyStu = ColbyStudent('Jane', 2022)
    csStu = CSStudent('Jim', 2024, 'Python')

    print('CS Student fav language:', csStu.getFavLang())
    print('CS Student name', csStu.getName())