I got a problem in the last exercise of chapter 6 in Python. I don't know what's wrong with it, and I keep getting the error:

Traceback (most recent call last):

File "python", line 51, in

NameError: name 'students' is not defined

I genuinly have no clue what's wrong here. Even tried copy-pasting answers I found on Github, but I keep getting the same error.

```
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) / float(len(numbers))
return total
def get_average(student):
homework = average(student["homework"])* 0.1
quizzes = average(student["quizzes"])* 0.3
tests = average(student["tests"])* 0.6
avrg = homework + quizzes + tests
return avrg
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(get_average(student))
return average(results)
print get_class_average(students)
print get_letter_grade(get_class_average(students))
```