Where is the problem in this code ? It displays error message string indices must be integer not str


#1

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)
    total = total/(len(numbers))
    return total
    
def get_average(student):
    homework = average(student["homework"])
    quizzes = average(student["quizzes"])
    tests = average(student["tests"])
    return .1*homework+.3*quizzes+.6*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 x in students:
        results.append(get_average(x))
    return average(results)

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

#2

here:

students = ["lloyd", 'alice', 'tyler']

the students shouldn't be strings, the students list should contain the dictionaries. Look at your get_average() function, here:

homework = average(student["homework"])

if student where a string, you will get an error. you can't access strings with string keys, only with integers index(that is also the error message by the interpreter)


#3

How to add dictionary to students list ? confused


#4

well, lloyd variable contains the lloyd dictionary, so we can just insert lloyd to the list


#5

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