```
`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 = 0
total = float(sum(numbers))
total /= len(numbers)
return total
def get_average(student):
homework = 0
homework = average(student["homework"])
quizzes = 0
quizzes = average(student['quizzes'])
tests = 0
tests = average(student['tests'])
return 0.10 * homework + 0.3 * quizzes + 0.60 * 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'
print get_letter_grade(get_average(lloyd))
def get_class_average(students):
students = list(students)
results = []
for student in students:
results.append(get_average(student))
return average(results)
print get_class_average(students)
print get_letter_grade(students)
```

Hello guys, i finished this part of the course but i had to use some of the forum help, and have a doubt hope you can help with:

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

I didn't really understand the students = list(students), making it with the forum help.. The python list function says it iterates all the values in a list, but being students already defined, why do you need to make this?

Thanks

`