I have written expected code for this exercise and got an expected output as well. Still I am receiving below error msg which is stopping me to continue the next chapter. Could any one please help me out here…

**Program**

for stud in student:

for task in stud:

if (task == “homework”):

homework = 0.1*average(stud[“homework”])
elif (task == “quizzes”):
quizzes = 0.3*average(task)

else:

tests = 0.6*average(task)

print sum([homework,quizzes,tests])

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]

}

student = {}

def average(numbers):

total = sum(numbers)

return (total / len(numbers))

def get_average(student):

for stud in student:

homework = 0.1*average(stud[“homework”])
quizzes = 0.3*average(stud[“quizzes”])

tests = 0.6*average(stud[“tests”])

print sum([homework,quizzes,tests])

student = [lloyd,tyler,alice]

get_average(student)

**Output:**

80.55

79.9

91.15

None

**Error Msg:**

get_average(alice) raised the following error: string indices must be integers, not str