Part of the Whole: TypeError: string indices must be integers, not str


#1

https://www.codecademy.com/courses/python-beginner-en-qzsCL/1/4

I don't understand why its giving me this error message, can anyone explain it to me?

Traceback (most recent call last):
File "python", line 52, in
File "python", line 48, in get_class_average
File "python", line 28, in get_average
TypeError: string indices must be integers, not str

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) / len(numbers)
    return total

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

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

students = ['lloyd', 'alice', 'tyler']
print(get_class_average(students))

#2

Here's what that error message is saying you're doing something similar to:

"this is a string"["kebab"]

See how that relates to your error message?


#3

oooooh! lol finally i get it. Thanks! :smiley: