Though my code executes and the output seems to be correct. I get a notification saying “Oops, try again. One of the following is missing or broken when we tried to use it: alice, lloyd, tyler, students, get_class_average, get_letter_grade”

did somebody face similar situation?

```
import math
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=float(sum(numbers))
return total/len(numbers)
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
return float((homework*0.1)+(quizzes*0.3)+(tests*0.6))
def get_letter_grade(score):
if(math.isnan(score)):
return "Error!"
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([alice, lloyd, tyler])
print get_letter_grade(get_class_average([alice, lloyd, tyler]))
```