Python 3- Assign grade

Question

I am trying to write a program that reads a list of scores and then assigns a letter grade based on the score. Define a function to prompt user to enter valid scores until they

Answer 1

That's what you're looking for:

from statistics import mean

def main():
   grades = getScores()
   grade = mean(grades)
   abcGrade = getGrade(grade)
   print(grade, "is an", abcGrade)


def getScores():
   grades = []
   while True:
      grade = int(input("Enter grades (-999 ends): "))
      if grade == -999: return grades
      grades.append(grade)

def getGrade(grade):
   best = 100
   if grade >= best - 10:
      return 'A'
   elif grade >=  best - 20:
      return 'B'
   elif grade >= best - 30:
      return 'C'
   elif grade >= best - 40:
      return 'D'
   else:
      return 'F'

main()

I've done as little modifications as I can. You must get all the grades and take the mean. The problem in your code was that it didn't return any value or append() to the list.