MultiChoice.py

#MultiChoice.py
#Python3

'''
python problem involving getting information from a file and formatting the results into columns?
Below is what the input and output should look like in a functioning code.

You have been asked to write a program to grade a multiple-choice exam.
 The exam has 20 to 30 questions, each answered with a where the first line is the key,
 consisting of 20 to 30 characters depending on the number of problems. The remaining lines
 on the file are exam answers; each consists of a student ID, a space and a string of characters
 (the length of the string matches with the key length). The program should read the name of
 the file interactively letter in the range of 'a' through 'f'. The data are stored in a file
 and when successful, should read the key followed by student records which are IDs and their answers.
 It should then output the ID and student answers followed by their grade and standing.

Sample input file abcdefabcdefabcdefab
c1234565 abcdefabcdefabcdefaa
c1234564 bccdefabcdefabcdefcc

Sample output:

Enter the filename: data6.txt
Key: abcdefabcdefabcdefab 20

Student ID  Student answers     Grade   Standing
c1234565    abcdefabcdefabcdefaa    19  above average
c1234564    bccdefabcdefabcdefcc    16  above average

The average of the score is 17.5
There are 2 records in the file
The student ID c1234565 have the highest score of 19

'''

def numCorrect(ans, corr):
    c = 0 # number of correct answers
    for x in range (0, len (corr)):
        if ans[x] == corr[x]:
            c += 1
    return c

filename = input ("Enter the filename: ")
first = True
id = []
answers = []
correct = []
total = 0.0
maxID = 0
highest = 0

with open (filename, "r") as f:
    for line in f:
        if first:
            key = line.strip()
            first = False
        else:
            li = []
            for i in line.split():
                li.append(i)
            id.append (li[0])
            answers.append (li[1])
            num_right = numCorrect (li[1], key)
            correct.append (num_right)
            if num_right > highest:
                maxID = li[0]
                highest = num_right

            total += num_right

average = float (total / len (id))

print ("Key: %s %d" % (key, len(key)))
print ("\nStudent ID\tStudent answers\t\tGrade\tStanding")
for x in range (len (id)):
    if correct[x] > average:
        grade = "above average"
    elif correct[x] < average:
        grade = "below average"
    else:
        grade = "average"

    print ("%s\t%s\t%s\t%s" % (id[x], answers[x], correct[x], grade))

print ("\nThe average score is %.1f" % average)
print ("There are %d records in the file." % len(id))
print ("The student ID %s has the highest score of %d" % (maxID, highest))