Traceback (most recent call last):

File "python", line 50, in

File "python", line 47, in get_class_average

File "python", line 27, in get_average

TypeError: int() argument must be a string or a number, not 'list'

I expect it to work.

```
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]
}
students=[lloyd,alice,tyler]
def average(numbers):
total=float(sum(numbers))/len(numbers)
return total
def get_average(student):
homework=average(int(student["homework"]))
quizzes=average(int(student["quizzes"]))
tests=average(int(student["tests"]))
return int(.1*homework+.3*quizzes+.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(students):
results=[]
for student in students:
results.append(int(get_average(student)))
return average(results)
print get_class_average(students)
print get_letter_grade(int(get_class_average(students)))
```