How is Everybody Doing? - STUDENT BECOMES THE TEACHER


#1

https://www.codecademy.com/courses/learn-python/lessons/student-becomes-the-teacher/exercises/how-is-everybody-doing-

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 = [lloyd, alice, tyler]

def average(numbers):
total = sum(numbers)
total = float(total)
return total/len(numbers)

def get_average(student):
homework = average(students[“homework”])
quizzes = average(students[“quizzes”])
tests = average(students[“tests”])
return homework0.1 + quizzes0.3 + tests*0.6

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))

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

print get_class_average(students)
print get_letter_grade(get_average)

it appears this error (I know that it isn’t about this lesson, but I lost all my progress and I had to rewrite it):

Traceback (most recent call last):
File “python”, line 47, in
File “python”, line 30, in get_average
TypeError: list indices must be integers, not str

The line 47 is «print get_letter_grade(get_average(lloyd))»

The line 30 is «homework = average(students[“homework”])»

I can’t find the error. Can anyone help me please?