Question

Using Python,

Write a class named Scores. This data structure will store a collection of lab scores (or programs scores or any other collection of scores). Since numbered assignments generally start with 1 – your first assignment this summer was lab 1 – the user of this class will think of this collection as being a 1-based list of values. All the methods which require a lab number will assume that value is based upon what the user sees, a 1 based list, and not what the programmers sees. You will have to use a list to store the scores. You could even use the FlexibleArray class instead of a traditional list to implement the 1-based list.

Specifics

Create the following methods and variable, EXACTLY as specified:

Class variable

NO_VALUE – set to -1

Constructor

Creates a list of length maxSize and sets the initial value of each variable to NO_VALUE.

Setters and Getters

getScore(index) – returns a single value from the array. The argument is the user’s index of the item to return.

getNumOfScores() – returns the number of non-default scores stored in the list.

getTotalPoints() – returns the total of the non-default scores stored in the list.

getMaxValue() – returns the maximum value in the list.

getMinValue() – returns the minimum, non-default value in the list.

getAverage () – returns the average of the non-default scores.

setScore(index, score) – the first argument is the user’s number of the lab, the second argument is the score. Only accept scores between 0 and 200. Return True if the value is accepted into the list, otherwise return False.

Write a program to thoroughly test the Scores class. This test program must test ALL the required functionality required within the class. The test program does not necessarily have to have user input from the keyboard, it just needs to completely test your class.

Answer 1

'''

Python version : 2.7

Python program to create and test class Scores

'''

class Scores:

              

               # class variable

               NO_VALUE = -1

              

               #constructor to create a list of length maxSize and sets the initial value of each variable to NO_VALUE.

               def __init__(self, maxSize):

                              self.lst = [Scores.NO_VALUE]*maxSize

               # function to return a single value from the array. The argument is the user’s index of the item to return.            

               def getScore(self,index):

                              #check if index is valid

                              if index >=0 and index < len(self.lst):

                                             return self.lst[index]

                              return Scores.NO_VALUE

              

               # function to return the number of non-default scores stored in the list.

               def getNumOfScores(self):

                              count = 0

                              for i in range(len(self.lst)):

                                             if self.lst[i] != Scores.NO_VALUE:

                                                            count = count + 1

                                                           

                              return count

              

               # function to return the total of the non-default scores stored in the list.

               def getTotalPoints(self):

                             

                              total = 0

                              for i in range(len(self.lst)):

                                             if self.lst[i] != Scores.NO_VALUE:

                                                            total = total + self.lst[i]

                                                           

                              return total

                             

               # function to return the maximum value in the list.

               def getMaxValue(self):

                              maxValue = Scores.NO_VALUE

                             

                              for i in range(len(self.lst)):

                                             if self.lst[i] > maxValue:

                                                            maxValue = self.lst[i]

                             

                              return maxValue

              

               # function to return the minimum, non-default value in the list.

               def getMinValue(self):

                              minValue = Scores.NO_VALUE

                             

                              for i in range(len(self.lst)):

                                             if self.lst[i] != Scores.NO_VALUE:

                                                            if minValue == Scores.NO_VALUE:

                                                                           minValue = self.lst[i]

                                                            elif self.lst[i] < minValue:

                                                                           minValue = self.lst[i]

                             

                              return minValue

              

               # function to return the average of the non-default scores.

               def getAverage(self):

                             

                              if(self.getNumOfScores() > 0):

                                             return float(self.getTotalPoints())/self.getNumOfScores()

                              return 0

              

               # function to set the score at the given index

              

               def setScore(self,index, score):

                              # check if index is valid

                              if index >=0 and index < len(self.lst):

                                             # check if score is valid

                                             if score >=0 and score <=200:

                                                            self.lst[index] = score

                                                            return True

                                             else:

                                                            return False

                              else:

                                             return False

                                            

# function to test the Scores class                                           

def main():

              

               score = Scores(20)

               print(score.setScore(0,10))

               print(score.setScore(1,-2))

               print(score.setScore(1,201))

               print(score.setScore(5,31))

               print('Number of scores : %d' %(score.getNumOfScores()))

               print('Score at 5 : %f' %(score.getScore(5)))

               print('Total points : %f' %(score.getTotalPoints()))

               print('Max Value : %f' %(score.getMaxValue()))

               print('Max Value : %f' %(score.getMinValue()))

               print('Average : %f' %(score.getAverage()))

#call the main function  

main()   

#end of program

              

Code Screenshot:

Output: