Day12 - Inheritance (Python 3)

• URL : https://www.hackerrank.com/challenges/30-inheritance/problem

• Objective
  • Today, we’re delving into Inheritance. Check out the attached tutorial for learning materials and an instructional video!
• Task

  • You are given two classes, Person and Student, where Person is the base class and Student is the derived class. Completed code for Person and a declaration for Student are provided for you in the editor. Observe that Student inherits all the properties of Person.

  • Complete the Student class by writing the following:

  • A Student class constructor, which has parameters:

    • A string, first name.
    • A string, last name.
    • An integer, id.
    • An integer array (or vector) of test scores, scores.
• A char calculate() method that calculates a Student object’s average and returns the grade character representative of their calculated average:
  • Grading Scale
    • O : 90 <= a <= 100
    • E : 80 <= a < 90
    • A : 70 <= a < 80
    • P : 55 <= a < 70
    • D : 40 <= a < 55
    • T : a < 40
• Input Format
  • The locked stub code in your editor calls your Student class constructor and passes it the necessary arguments. It also calls the calculate method (which takes no arguments).
  • You are not responsible for reading the following input from stdin: The first line contains first name, last name, and id, respectively. The second line contains the number of test scores. The third line of space-separated integers describes scores.
• Constraints

  • 1 <=

    first name

    ,

    last name

    <= 10

  • id

    = 7

  • 0 <= score, average <= 100
• Output Format
  • This is handled by the locked stub code in your editor. Your output will be correct if your Student class constructor and calculate() method are properly implemented.

문제풀이

• 설명은 긴데.. 그냥 Person 클래스를 상속받고, 생성자 함수에서는 score를 추가하여 준다
• score를 평균을 낸 뒤에, 해당 평균이 어느 구간에 속하면 O, E, A, P, T, D를 리턴하게 만들어주면 됨

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class Person:
	def __init__(self, firstName, lastName, idNumber):
		self.firstName = firstName
		self.lastName = lastName
		self.idNumber = idNumber
	def printPerson(self):
		print("Name:", self.lastName + ",", self.firstName)
		print("ID:", self.idNumber)

class Student(Person):
    #   Class Constructor
    #   
    #   Parameters:
    #   firstName - A string denoting the Person's first name.
    #   lastName - A string denoting the Person's last name.
    #   id - An integer denoting the Person's ID number.
    #   scores - An array of integers denoting the Person's test scores.
    #
    # Write your constructor here
    def __init__(self, firstName, lastName, idNumber, scores):
        self.firstName = firstName
        self.lastName = lastName
        self.idNumber = idNumber
        self.scores = scores
    
    #   Function Name: calculate
    #   Return: A character denoting the grade.
    #
    # Write your function here
    def calculate(self):
        avg = sum(self.scores) / len(self.scores)
        if avg >= 90:
            return 'O'
        elif avg >= 80:
            return 'E'
        elif avg >= 70:
            return 'A'
        elif avg >= 55:
            return 'P'
        elif avg >= 40:
            return 'D'
        else :
            return 'T'

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