Wrong output

Question

Hello everyone,

I made this code to calculate the average grades for four students in the list called 'studentgrades;. I want the code to calculate the average grade for every student in the list. If i run it, it returns the average of the first two lists. but i want it to output the average for every single list I hope i made it clear, if its not please ask me.

studentGrades = [[95, 92, 86],[66, 75, 54],[89, 72, 100],[34, 0, 0]]

def average_per_student(studentGrades):
res = 0
loopCount = 0
answer = []
for row in studentGrades:
for item in row:
loopCount = loopCount + 1
res = res + item
average = res / loopCount
answer.append(average)
return answer

def average_all_students(studentGrades):
som = 0
answer = 0
loopCount = 0
for row in studentGrades:
for item in row:
som = som + item
loopCount = loopCount + 1
total = answer + som
#loopCount = loopCount + 1
antw = total / loopCount
return antw

print(average_per_student(studentGrades))

print(average_all_students(studentGrades))

Answer 1

def average_per_student(studentGrades):
answer = []
for row in studentGrades:
res = 0
loopCount = 0
for item in row:
loopCount = loopCount + 1
res = res + item
answer.append(res/loopCount)
return answer

def average_all_students(studentGrades):
res = 0
loopCount = 0
for row in studentGrades:
for item in row:
res = res + item
loopCount = loopCount + 1
return res/loopCount

Answer 2

Abdelhakim Dahaman I did not fully read the code yet, but it seems to me that you have so many variables that really have no use.
1. Make a function that calculates the average of ONE student only.
2. Use it in a second function, that calculates the average of all students.

Answer 3

ok thanks, im gonna try that👍

Answer 4

sometimes......it's better to scrap it all start again:-
def average_per_student(grades):
aps = []
for marks in grades:
aps.append(round(sum(marks)/len(marks), 2))
return aps

def average_all_students(grades):
average = 0
for marks in grades:
average += sum(marks)/len(marks)
return round(average/len(grades), 2)

studentGrades = [[95, 92, 86], [66, 75, 54], [89, 72, 100], [34, 0, 0]]
print(*average_per_student(studentGrades), sep=', ')
print(average_all_students(studentGrades))

also..have a look at the statistics module for "mean" (average).