Part of the Whole


#1



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


Traceback (most recent call last):
File "python", line 54, in
File "python", line 35, in get_average
TypeError: list indices must be integers, not str


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

def average(numbers):
    total = sum(numbers)
    total = float(total)/len(numbers)
    return total
    
def get_average(student):
    homework = average(student['homework'])
    quizzes = average(student['quizzes'])
    tests = average(student['tests'])
    homework *= 0.1 
    quizzes *= 0.3
    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(students))


#2

here:

print get_letter_grade(get_average(students))

get_average is designed to calculate the average for a single student, for example lloyd:

get_average(lloyd)

get_average is not designed to handle a list of students


#3

I made the requested change and now I'm getting this error:

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

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


#4

The url will just load my own code. Please copy paste your updated version to the forum


#5

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]
}
students = [alice,lloyd,tyler]
# Add your function below!

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

def average(numbers):
    total = sum(numbers)
    total = float(total)/len(numbers)
    return total
    
def get_average(student):
    homework = average(student['homework'])
    quizzes = average(student['quizzes'])
    tests = average(student['tests'])
    homework *= 0.1 
    quizzes *= 0.3
    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))

#6

look here:

results.append(get_average(students))

what did i say about get_average?


#7

My mistake. I changed it in the print line and not where you told me too.

Now I'm getting:

Oops, try again. get_class_average([alice]) returned 80.55 instead of 91.15 as expected

But I'll work on that.


#8

If you need more help, post an updated version of your code


#9

This one is kicking my butt.

Oops, try again. get_class_average([alice]) returned 80.55 instead of 91.15 as expected

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]
}
students = [alice,lloyd,tyler]
# Add your function below!

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

def average(numbers):
    total = sum(numbers)
    total = float(total)/len(numbers)
    return total
    
def get_average(student):
    homework = average(student['homework'])
    quizzes = average(student['quizzes'])
    tests = average(student['tests'])
    homework *= 0.1 
    quizzes *= 0.3
    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))

#10

in your get_class_average, your function parameter contains the list with students. So you can just loop over students, and append the average for student to results

Don't overwrite the function parameter


#11

By adding the the second list students = [alice,lloyd,tyler]... I get it now.


#12

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