我在第9课的CodeAcademy上（“大家都好吗？”），我的错误消息如下：
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
我不知道该怎么办，我已经搜索了解决方案，他们建议我使用变量q，我将其放入代码中，但是问题似乎出在上一课中我已经存在的代码中。
# 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
在get_class_average调用列表中get_average的对象students。但是，这些对象是字符串。相反，您可能希望使用之前定义的变量。所以更换线
students = ["lloyd", "alice", "tyler"]
和
students = [lloyd, alice, tyler]
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