#phyton

''' Please help me to solve this error. Error: Traceback (most recent call last): File "/Users/mdhossain/Desktop/p4.py", line 91, in main() File "/Users/mdhossain/Desktop/p4.py", line 83, in main (x, y, z) = get_scores() TypeError: cannot unpack non-iterable NoneType object ''' # Please do not use append & tuple

def get_scores():

#Ask user to input x = int(input('Enter 1st posative number: ')) #check valid number while x < 0: print('invalid input! Must be posative') x = int(input('Enter 1st posative number: ')) break

#Ask user to input y = int(input('Enter 3rd posative number: ')) #check valid number while y < 0: print('invalid input! Must be posative') y = int(input('Enter 1st posative number: ')) break

#Ask user to input z = int(input('Enter 3ed posative number: ')) #check valid number while z < 0: print('invalid input! Must be posative') z = int(input('Enter 3rd posative number: ')) # it will return xyz return x, y, z break

def calculate_average(score1, score2, score3):

#get avg value return (score1 + score2 + score3) / 3

#grade

def assign_grade(score):

if (score >= 90):

return 'A'

elif (score >= 80 and score < 90):

return 'B'

elif (score >= 70 and score < 80):

return 'C'

elif (score >= 60 and score < 70):

return 'D'

else:

return 'F'

def show_results(num, letterGrade):

print("Average score:", num)

print("Assigned letter grade:", letterGrade)

def main():

(x, y, z) = get_scores()

avgScore = calculate_average(score1, score2, score3)

letterGrade = assign_grade(avgScore)

show_results(avgScore, letterGrade)

main()