Student Becomes the Teacher, Part of the whole


#1

https://www.codecademy.com/courses/python-beginner-en-qzsCL/1/4?curriculum_id=4f89dab3d788890003000096

I am getting the following error message:

" Oops, try again. get_class_average([alice]) resulted in an error: list indices must be integers, not str"

Apologies in advance if I have missed something obvious in the following 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 = float(sum(numbers))
    a = total / len(numbers)
    return a
    
def get_average(student):
    homework = average(student["homework"]) * 0.1
    quizzes = average(student["quizzes"]) * 0.3
    tests = average(student["tests"]) * 0.6
    total = homework + quizzes + tests
    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"
        
students = [lloyd, alice, tyler]
        
get_letter_grade(get_average(lloyd))
print get_letter_grade     
                
    

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

All help greatly appreciated.


#2

lets add a function call:

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

then we can pinpoint the error with help of the interpreter message.

the problem is here:

 a = get_average(students)

students is a list, get_average is only designed to calculate the average of a single student (this is why we have a loop)

hope this will help you, your code has more mistakes, see if you can find them now. If not, post an updated version of your code and i will help you further


#3

Thanks for your prompt response, I think my issue was with indentation?

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


#4

given indention determines nesting/hierarchy, yes your problem was indention but seems you fixed it, well done :slight_smile:


#5

Apparently, your problem was not with indentation,but the parameter you sent in "get_avarage()".Earlier you sent the whole list "students" instead of "student" that you declared as a variable in the for loop.


#6

yes, he knows. He resolved the problem


#7