'''

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)

total = total / len(numbers)

return total

def get_average(student):

homework = average(student["homework"])

quizzes = average(student["quizzes"])

tests = average(student["tests"])

total = (homework * 0.1) + (quizzes * 0.3) + (tests * 0.6)

return total

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"

print get_letter_grade(get_average(lloyd))

def get_class_average(students):

results = []

for student in "class":

get_average(student)

results.append()

return average(results)

'''

# This code is returning "Oops, try again. get_class_average([alice]) resulted in an error: string indices must be integers, not str", and I can't figure out why

"Oops, try again. get_class_average([alice]) resulted in an error: append() takes exactly one argument (0 given)"

I'm having the exact same problem.

Here is my 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)
total = total / len(numbers)
return total
print total
```

# def get_average(student):

```
homework = average(student["homework"]) * 0.1
quizzes = average(student["quizzes"]) * 0.3
tests = average(student["tests"]) * 0.6
return homework + quizzes + tests
```

# 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"
print get_letter_grade(get_average(lloyd))
```

# def get_class_average(students):

```
students = [lloyd, alice, tyler]
results = []
for student in students:
results.append(get_average(student))
return results
```

I just added average() to the return line and it works!!!

If anyone is having the same problem here is the working code:

students = [lloyd, alice, tyler]

def get_class_average(students):

results = []

for student in students:

results.append(get_average(student))

return average(results)