I am new at coding. I am able to find out the error. Please help me

```
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)
avg = total/len(numbers)
return avg
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
homework_weight = 0.1*homework
quizzes_weight = 0.3*quizzes
tests_weight = 0.6*tests
sum_weight = homework_weight + quizzes_weight +tests_weight
return sum_weight
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"
marks_avg = get_average(tyler)
grade = get_letter_grade(marks_avg)
print grade
students = ['lloyd','alice','tyler']
def get_class_average(students):
results = []
for items in students:
print items
average_weight = get_average(items)
results.append(average_weight)
class_average = average(results)
return class_average
class_avg = get_class_average(students)
print class_avg
print get_letter_grade(class_avg)
```