Even I am facing the same issue.

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)

results = total/len(numbers)

return results

l=[3.4,56,5.6,78.7]

average(l)

def get_average(student):

homework = average(student["homework"])

quizzes = average(student["quizzes"])

tests = average(student["tests"])

weights = homework *0.1 + quizzes*0.3+tests *0.6

return weights

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"

# get_letter_grade(get_average(lloyd))

def get_class_average(students):

result=[]

for item in students:

avg=get_average(item)

result.append(avg)

return average(result)

students_list=[lloyd, alice, tyler]

print get_class_average(students_list)

print get_letter_grade(get_class_average(students_list))

**ERROR**:-