traceback problem

[ray.shahil95]

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)
    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


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"

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

[Gribouillis]

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

get_class_average([alice])

[ray.shahil95]

still there is one error.

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

[Gribouillis]

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

[ray.shahil95]

absolutely..

[Gribouillis]

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.

[ray.shahil95]

Ok i got it. Thank you for support.