回答此问题可获得 20 贡献值,回答如果被采纳可获得 50 分。
<p>伙计们,我刚开始学Python。。我对此一无所知。我把这张单子和字典有关的问题。。它向我显示了一条错误消息。
错误O/P和代码如下所示。。你知道吗</p>
<pre><code>Error:
Traceback (most recent call last):
File "python", line 48, in <module>
File "python", line 45, in get_class_average
File "python", line 25, in get_average
TypeError: list indices must be integers, not st
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 = float(sum(numbers))/len(numbers)
return total
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"
get_letter_grade(get_average(lloyd))
def get_class_average(students):
results=[];
results.append(get_average(students));
return average(results)
sts=[lloyd,alice,tyler];
get_class_average(sts)
</code></pre>