``````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)
result = float(total)/len(numbers)
print result
return result

def get_average(student):
homework=average(student['homework'])
quizzes=average(student['quizzes'])
tests=average(student['tests'])
a= 0.1 * homework + \
0.3 * quizzes + \
0.6 * tests

return a

if score>=90:
return "A"
elif score>=80:
return "B"
elif score>=70:
return "C"
elif score>=60:
return "D"
else:
return "F"

def get_class_average(students) :
result=[]
for student in students:
result.append(get_average(student))
return average(result)

get_class_average(['alice'])
``````

'''
In above code it shows following errors:
Traceback (most recent call last):
File "python", line 57, in <module>
File "python", line 53, in get_class_average
File "python", line 28, in get_average
TypeError: string indices must be integers, not str

hi! `get_class_average()` takes a list of students, not a list of strings. Use

``````get_class_average([alice])
``````

still there is one error.

"Oops, try again. get_class_average([alice]) returned 85.6875 instead of 91.15 as expected"

Well, are sure it is `0.1 * homework + 0.3 * quizzes + 0.6 * tests` ?

absolutely..

First a little test:

``````>>> def av(L):
...  return float(sum(L))/len(L)
...
>>> 0.1 * av([100, 92, 98, 100]) + 0.3 * av([82, 83, 91]) + 0.6 *av([89, 97])
91.14999999999999
``````

This shows that 91.15 is the correct answer.

Now running your code gives 91.15 (replace the last statement with `print(get_class_average([alice]))`), so there is no error. The error must be in the code that prints Oops try again etc.

Ok i got it. Thank you for support.

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