9/9: Code works, but I got the wrong answer?


#1

The answer I got for the average was 83.8666666667, which is correct, but the corresponding letter is A (shouldn’t it be B?)

Can someone help me find out what I did wrong? :thinking:
(I think it’s mostly the last part that’s interesting, but maybe I did something wrong in the beginning that messes it up?)

lloyd = {
  "name": "Lloyd",
  "homework": [90.0, 97.0, 75.0, 92.0],
  "quizzes": [88.0, 40.0, 94.0],
  "tests": [75.0, 90.0]
}
alice = {
  "name": "Alice",
  "homework": [100.0, 92.0, 98.0, 100.0],
  "quizzes": [82.0, 83.0, 91.0],
  "tests": [89.0, 97.0]
}
tyler = {
  "name": "Tyler",
  "homework": [0.0, 87.0, 75.0, 22.0],
  "quizzes": [0.0, 75.0, 78.0],
  "tests": [100.0, 100.0]
}

# Add your function below!
def average(numbers):
  total = sum(numbers)
  average = float(total)/len(numbers)
  return average

def get_average(student):
  homework = average(student["homework"])
  quizzes = average(student["quizzes"])
  tests = average(student["tests"])
  return 0.1 * homework + 0.3 * quizzes + 0.6 * tests

def get_letter_grade(score):
  if score >= 90:
    return "A"
  elif score >= 80:
    return "B"
  elif score >= 70:
    return "C"
  elif score >= 60:
    return "D"
  else:
    return "F"

def get_class_average(class_list):
  results = []
  for student in class_list:
    get_average(student)
    results.append(get_average(student))
  return average(results)

students = [lloyd, alice, tyler]
print get_class_average(students)
print get_letter_grade(get_class_average)

#2

the purpose of get_letter_grade is to convert number grade to letter grade, so it expects a number as argument, not a function (get_class_average)

the result of calling get_class_average is a integer, that would work


#3

Thanks!

I changed the last line to

print get_letter_grade(get_class_average(students))

And now it works :slight_smile:


#4

do you also understand why this change is important?


#5

It’s because I want the letter for the class average of the students (a number) right?
So if I just put get_letter_grade(get_class_average) there’s no grade/number to get a corresponding letter for. And now that I’ve changed it to (get_class_average(students)) I’m basically just saying get_letter_grade(83.8666666667), which gives me the right answer. :slight_smile:


#6

exactly, very good :slight_smile:


#7

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