Question

Python 3.7.2 (Please comment on code and post screenshot of your source code. Thanks)

class1:

Part 1 You just finished administering the final exam for all of the students in the "Introduction to Computer Programming classes this semester. The exam was a 25 question multiple choice exam, and it is your job to grade the exams. You have all of the scores stored in a series of text files (click here to download these files). To begin, download the data files and store them in a folder on your computer. Then create a new Python program inside of this folder called "YourName Assignment09 py Next, write a program that lets the user type in the name of a file. Attempt to open the supplied file for read access. If the file exists you can print out a confirmation message. If the file doesn't exist you should tell the user that the file cannot be found. Hint: use a trylexcept block to do this (don't just use a series of "if" statements- we want this program to be as "generic" as possible) Here's a sample running of the program: Enter a class file to grade (i.e. class1 for class1.txt): foobar File cannot be found. Enter a class file to grade (i.e. class1 for class1.txt): class1 Successfully opened class1.txt N00000001,A,A,D,D,C, D,D,A,,C,D,B,C,, B,C,B,D,A,C,,A,,C,D N00000002,,A,,D,,B,D,A,C,C,D, ,A,A,A, C,B,D,C,C,A,A, B,,D N00000003,B,A, , D , C , B , D , A , C , C , , B,A,B,A,C,B,D,A,,A, , B,D,D N00000004,B,B,D, ,,B,D,A,C,C,D,B,A,B,A,C,B,D, , C,A,D,B,C,D N00000005,B,A, ,D, ,B,D,A,C, C, D,B,A, B,A,C,B,D,D, C,A,A,,D,D N00000006 , B , A , D , A , C , B , D , A , C , C , C , В , A , D , A , C, , C,A,C,A,C,B,D,A N00000007 , B , A, D, D, C, B, D, A, C, , D, B, A, B, A, C,B,D, , C,A,A,B,D, N00000008 , Α, A, D, D , C, , D, A, C,C,B,C,A,B,A,A,B,D,A,C,A, , B,B,D N00000009 , B ,A,,D,C,B,D,A,C,A,D,B,A,B,A,A,B,D,A,C,A,A,B,D,D N00000010,,A, D,B,C,B,D,A,C,C,D,B, A, B,A, C,B,D,A,D, ,,B,D,B N00000011,B,A,D, ,C,B,D,A, C,D,D,B,A, B,A,C, B,D,A,C,A, B,B,D,D N00000012,B, , D , D , C , В , D , A , C , C , D , В , А , В , A , A , В , D , A ,,A,A,A, , С N00000013,,A, D, ,B,B, ,A,C,A,D,B,A,B,D,C,B,D,A, C,A,A, B,D,D N00000014,B,B,D,D,C,B, , D , C , C , D , B , A , B , A , C ,,D,A,C,A,A,,D,D N00000015,A,C, C,D,C,B, ,A, C,C,D,B, A, B,A, C,B,D,A,C,A,B, ,D,D N00000016,B,A, C,D, ,B,D,A, C,C,D,B,A, B,A,C, B,D,A,C,A,A, B,D,D N00000017,B,A,D,D,C,B,C,A,D,C,D,A,A,D,A,C,B,D,D,B,,A,B,D,D NO0000018 , B , A, D, A , C , B, D, A , C , C , D, B, A, B,, , B,D,A,B,A,A,B,,D N00000O19 , В , A , D, D , C , B , D , C , C , C , , B, , B,D,C,B,D,A,,A,A,B,D,D N00000020,B, , D, D, C, B, D, A , C , B , ,,A,C,A,D,B,D,B,C,A,A,B,D,D

Answer 1

while True:
  

    try:
        filename = input("Enter a class to grade (i.e. class1 for class1.txt): ")
        filenametxt = filename + ".txt"
        f = open(filenametxt,"r")
        #file=f.read()
          

    except:
        print("File cannot be found.")
        print()
          
    else:
        print("Successfully opened ", filenametxt,sep='')
        print()
        break

file = f.read()

splitdata = file.split("\n")
#print(splitdata)

#for line in splitdata:

#    splitline = line.split(",")
  
print("**** ANALYZING ****")
print()
#count = 0
#N = 0
#invalid=0
answerkey = "B,A,D,D,C,B,D,A,C,C,D,B,A,B,A,C,B,D,A,C,A,A,B,D,D"
answerkey = answerkey.split(",")

invalid = 0
good = 0
grades = [ ]
valid_lines = []
final = []
for line in splitdata:
  
    splitline = line.split(",")
  
    count = 0
    N = 0
  
    invalid_line = 0
  
    for each in splitline:
#       good +=1
        #print(each)
        if count == 0:
            if each[0] != "N" or len(each) != 9 or each[1:].isnumeric() == False:
                print("Invalid line of data: N# is invalid")
                print(splitline)
                print()
                invalid += 1
                invalid_line += 1
            #continue
             
        count+=1

     
    if count != 26:
        print("Invalid line of data: does not contain exactly 26 values:")
        print(splitline)
        print()
        invalid += 1
        invalid_line += 1

    if invalid_line == 0:
        valid_lines.append(splitline)
        good += 1
        final.append(splitline[0])

      

  
if invalid == 0:
    #if good == len(splitline) and N == 1
    print("No errors found!")
    print()

print("**** REPORT ****")
print()
print("Total valid lines of data:",good)
print("Total invalid lines of data:",invalid)
print()

for splitline in valid_lines:
    correct = 0
    for i in range(len(splitline)-1):
        if splitline[i+1] == answerkey[i]:
            correct +=4
        elif splitline[i+1] == "":
            correct += 0
        elif splitline[i+1] != answerkey[i]:
            correct -= 1
    grades.append(correct)

grades2 = []
for grade in grades:
    grades2.append(grade)
grades2.sort()

sum_of_grades = sum(grades)
avg = (sum_of_grades / len(grades))
print("Mean (average) score:",format(avg,".2f"))
print("Highest score:",max(grades))
print("Lowest score:",min(grades))
print("Range of scores:", (max(grades) - min(grades)))

if len(grades) % 2 != 0:
    grades2.sort()
    print("Median score:",grades2[int(len(grades)//2+1)])
else:
    grades2.sort()
    median = (grades2[int(len(grades)/2-1)] + grades2[int(len(grades)/2)])/2
    print("Median score:", median)

unique=[]
seen=[]

for i in range(len(grades)):
    if grades[i] not in unique:
        unique.append(grades[i])
        seen.append(1)
    else:
        position = unique.index(grades[i])
        seen[position] += 1
    
mode = max(seen)
loc = seen.index(mode)
mode_list=[ ]

for i in range(len(seen)):
    if seen[i] == mode:
        mode_list += [unique[i]]
      

print("Mode score(s): ",end="")
for item in mode_list:
    print(item,"",end="")

final_grades = filename + "_grades.txt"
grades_file = open(final_grades,'w')
for i in range(len(final)):
    forfile = (final[i] + ','+ str(grades[i])+'\n')
    grades_file.write(forfile)
  
grades_file.close()

print()
curveq = input("Would you like to apply a curve to the scores? (y)es or (n)o?: ")
if curveq == "y":
    newavg = float(input("Enter desired mean score: "))
  
    adding = newavg - avg
  
    curved_grades = []
    for i in range(len(grades)):
        new_score = grades[i] + adding
        new_score = format(new_score,'.2f')
        curved_grades.append(new_score)
      
    curved_file = filename + "_grades_with_curve.txt"
    curved_grade = open(curved_file,'w')
    for i in range(len(final)):
        forcurvedfile = (final[i] + ',' + str(grades[i]) + ',' + str(curved_grades[i]) + '\n')
        curved_grade.write(forcurvedfile)
    curved_grade.close()
    print("Done! A new grade file has been written (",curved_file,")",sep='')