Hi,

(after maaaaaaaaany attemps) I ended 8/9, but I'm trying to understand this code better, so I put it to Python's visualizer (here).

At codecademy it's 'way to go!', but visualizer says something different...

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]
}
# Add your function below!
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"])
homework = 0.1*average(student["homework"])
quizzes = 0.3*average(student["quizzes"])
tests = 0.6*average(student["tests"])
return homework+quizzes+tests
print homework+quizzes+tests
def get_letter_grade(score):
if score >= 90:
return "A"
if score >= 80:
return "B"
if score >= 70:
return "C"
if score >= 60:
return "D"
else:
return "F"
def get_class_average(students):
results = []
for student in students:
get_average(student)
results.append()
return average(results)
print get_class_average(tyler)
```

After step 20 (it's executing `print get_class_average(tyler)`

) errors occurs - in lane 28 (`homework = average(student["homework"])`

) it calls "TypeError: string indices must be integers, not str"

Why is it different in codecademy and visualizer? I'm using P2.7.8 on it.

And how make it works?

Thanks in advance,

Szkaplerny