5.2. Evaluate Attendees

The cast and crew of TGS attended a seminar and they were required to take a test after finishing a series of educational material. The results of the test are critically important because it will determine the fate of the show, being a clear indication of how much they care about the company policies. To determine the results with the highest possible accuracy, they hire you to create a program that calculates the results.

Write a function named evaluate_attendees which takes two string arguments, namely answer key and responses files. The answer key file consists of a single line of uppercase letters between A-E separated with a space character. The responses file consists of multiple lines where each line has attendee name and responses separated with a space character. Your function should generate the points of each attendee and return the list of tuples consisting of attendee’s name as string and her/his point as float in descending order with respect to points.

A point of a participant can be calculated as follows: point = correct answers - wrong answers * 0.25

Hint: You can use built in sorted() function by using lambda expression.

Sample I/O:

Sample function call:
    evaluate_attendees("key.txt", "attendees.txt")

Content of the file "key.txt":
    A B A B C

Content of the file "attendees.txt":
    Jenna A A A A A
    Tracy D E D E A
    Liz A B A B E
    Lutz A B A D D
    Toofer E B A B C
    Frank E E E E E

Return Value:
    [('Liz',3.75),('Toofer',3.75),('Lutz',2.5),('Jenna',1.25),('Tracy',-1.25),('Frank',-1.25)]

Show the Answer

def evaluate_attendees(key_path, grade_path):
    attendees = []

    key_file = open(key_path, "r")
    key = key_file.read().split()
    key_file.close()

    questions = len(key)

    input_file = open(grade_path, 'r')
    for line in input_file.readlines():
        correct = 0
        wrong = 0
        name = line.split()[0]                # seperating name from the rest of the list
        responses = line.split()[1:]          # getting the responses for the exam
        for i in range(questions):            # checking responses one by one to determine result
            if responses[i] == key[i]:
                correct += 1
            else:
                wrong += 1
        attendees.append((name, correct - 0.25 * wrong))

    input_file.close()

    attendees_sorted = sorted(attendees, key=lambda item: item[1], reverse=True) # sort the list according to points
    return attendees_sorted