Class Inheritance

### Link to the problem description: https://www.hackerrank.com/challenges/30-inheritance/problem

### Header Locked stub code section (by HackerRank)
## Person class is defined, the __init__ and print methods are defined, which later are used by the new student class.
# Inputs are first, last name and ID
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)
###

### My code section
class Student(Person):
## Init method called on the inherited person class, defines the student. Scores are part of the input and stored
    def __init__(self, firstName, lastName, idNumber, scores):
        Person.__init__(self, firstName, lastName, idNumber)
        self.scores = scores
        
# An if chain represents a switch used to define the student's grade based on test scores
    def calculate(self):
        mean = sum(scores)/len(scores)
        grade = None
        if mean < 40:
            grade = "T"
        elif mean < 55:
            grade = "D"
        elif mean < 70:
            grade = "P"
        elif mean < 80:
            grade = "A"
        elif mean < 90:
            grade = "E"
        else:
            grade = "O"
        return grade
        
### Footer Locked stub code section (by HackerRank)
## Stores input and calls upon the newly defined student's class methods
line = input().split()
firstName = line[0]
lastName = line[1]
idNum = line[2]
numScores = int(input()) # not needed for Python
scores = list( map(int, input().split()) )
s = Student(firstName, lastName, idNum, scores)
s.printPerson()
print("Grade:", s.calculate())