# 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]
}

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

def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
return .1*homework+.3*quizzes+.6*tests

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)

#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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