How is everybody doing? ...not good


#1




Traceback (most recent call last):
File "python", line 56, in
File "python", line 52, in get_class_average
File "python", line 28, in get_average
TypeError: string indices must be integers, not str

Hi guys i really need some help. So prior to reaching this stage, i received no error messages regarding line 28 [homework = average(student["homework"])*0.1] but now im receiving all these error messages. I'm trying to print out the result of calling my get_class_average function with students as my input as well as print the class' average for the get_letter_grade function but I've messed up somewhere and im completely new to coding so I'm not sure what to do...any help?


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)
    new_total = total / len(numbers)
    return new_total

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 or score > 90:
        return "A"
    elif score ==80 or score >80:
        return "B"
    elif score == 70 or score > 70:
        return "C"
    elif score == 60 or score > 60:
        return "D"
    else: 
        return "F"
testing = get_letter_grade(lloyd)
print testing

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


#2

ok so i actually solved my own problem 2 seconds after.

i realised that my last print command was wrong it shoul have been get_letter_grade(get_class_average(students)) in order to actually acquire the letter grade for the class average :blush:


#3

does it also make sense why? your get_letter_grade expects a number. what you first did was passing students as arguments, students is a list

get_letter_grade isn't designed to handle a list


#4

Oh wow yeah I see what you mean! That makes sense! Thanks for the explanation! :slight_smile:


#5