# 8. Part of the Whole

#1

I keep getting the error message "Oops, try again. get_class_average([lloyd]) returned 85.85 instead of 80.55 as expected." This happened for alice as well.

``````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)
total = float(total)
return total/len(numbers)

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

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"

results = []
students = [lloyd, alice, tyler]

def get_class_average(students):
for student in students:
results.append(get_average(student))
return average(results)``````

#2

Why is `results=[]` outside?

#3

I had been moving things around in an effort to get it to work. When I move results = [] inside the function, it says that it works, but doesn't display anything.

#4

Well...returning things doesn't necessarily display things into the console (it is just for functions to give a value but doesn't `print`). If you want, you can `print` by calling the function and using the `print` statement.

eg

``````students = [lloyd, alice, tyler]

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

print get_class_average(students)``````

#5

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