Could anyone help me? ... I am stucked with it. I am not understanding what and where I suppose change in my code. There is something that Python is noticing that is string or integer. I really dont get it.

Code:

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]

}

def average(numbers):

total = sum(numbers)

total = float(total) / len(numbers)

return total

def get_average(student):

homework = average(student["homework"])

quizzes = average(student["quizzes"])

tests = average(student["tests"])

return (0.1 * homework) + (0.3 * quizzes) + (0.6 * tests)

def get_letter_grade(score):

if type(score) == int:

if score >= 90:

return "A"

elif score >= 80:

return "B"

elif score >= 70:

return "C"

elif score >= 60:

return "D"

else:

return "F"

students = ["lloyd", "alice", "tyler"]

def get_class_average(students):

results = []

for x in students:

results.append(get_average(x))

return average(students)

print get_class_average(students)

print get_letter_grade(get_class_average(students))

This is the error that I am getting:

Traceback (most recent call last):

File "python", line 53, in

File "python", line 50, in get_class_average

File "python", line 27, in get_average

TypeError: string indices must be integers, not str