python-2.7 - 您的代码抛出“字符串索引必须是整数，而不是 str”错误

Question

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]
}

student=[lloyd,alice,tyler]

def get_avg(stu_lst):
    return sum(stu_lst)/float(len(stu_lst))

def weight_average(lst):
    return get_avg(lst["homework"])*0.1+get_avg(lst["quizzes"])*0.3+get_avg(lst["tests"])*0.6

def get_average(students):
    for student in students:
       print weight_average(student)

get_average(student)

Answer 1

你identation这里有问题：

修复它，它会工作。