Schoko Unter - 1 year ago 99

Python Question

I am at CodeAcademy at Lesson 9 ("How is everybody doing?")

My error message is the following:

`Traceback (most recent call last):`

File "python", line 60, in <module>

File "python", line 52, in get_class_average

File "python", line 28, in get_average

TypeError: string indices must be integers, not str

I don't know what to do, I searched for solutions already, they suggested me to use the variable

`q`

`# creating students`

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)

return float(total)/ len(numbers)

def get_average(student):

homework = average(student["homework"])

quizzes = average(student["quizzes"])

tests = average(student["tests"])

return 0.1 * homework + 0.3 * quizzes + 0.6 * 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"

#summarising students to classlist

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

# calculating class average

def get_class_average(students):

results = []

for student in students:

results.append(get_average(student))

return average(results)

#printing grades

print get_letter_grade(get_average(lloyd))

print get_letter_grade(get_average(alice))

print get_letter_grade(get_average(tyler))

q = get_class_average(students)

#printing class average

print get_letter_grade

print q

Answer Source

In `get_class_average`

you call `get_average`

with the objects in the `students`

list. However, these objects are strings. Instead, you probably want the variables you defined before. So replace the line

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

with

```
students = [lloyd, alice, tyler]
```