Question

以下代码出错，我在过去两天内无法调试。我是一个完全的初学者，在学习了c之后开始使用python。

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)
    result = (total/len(numbers))
    return result


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


def get_letter_grade(score):
    if score >= 90:
        return "A"
    elif score >= 80 and score < 90:
        return "B"
    elif score >= 70 and score < 80:
        return "C"
    elif score >= 60 and score < 70:
        return "D"
    else:
        return "F"

result = get_average(lloyd)
print get_letter_grade(result)
students = {"name": ["lloyd", "alice", "tyler"]}

def get_class_average(students):
    results = []
    for student in students:
        final = get_average(student["name"])
        results.append(final)
    return average(results)

print get_class_average(students["name"])
print get_letter_grade(get_class_average(students))

错误是（忽略上面代码中的不正确缩进）：

追踪（最近一次通话）： File＆＃34; python＆＃34;，第51行，in 在get_class_average中的文件＆＃34; python＆＃34;，第47行 TypeError：字符串索引必须是整数，而不是str

Answer 1

get_class_average(students["name"])将字符串列表传递给函数。
稍后，您使用for student in students:循环显示该列表，现在student是单字符串，即列表中的元素。
然后，您执行student["name"]，它尝试使用另一个字符串索引字符串student。

这是不可能的，甚至没有意义，因此错误。

Answer 2

社区需要缩进才能运行代码。 ForceBru是对的，你不能声明一个字符串值列表

students = {“name”：[“lloyd”，“alice”，“tyler”]}来实现这个目标对于学生：最终= get_average（学生[ “名称”]）

既然你已经宣布了上面的学生，为什么不呢学生= {“姓名”：[劳埃德，爱丽丝，泰勒]}

Answer 3

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):
    return (float(sum(numbers)) / len(numbers))

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

def get_letter_grade(score):
    if score >= 90:
        return "A"
    elif score < 90 and score >= 80:
        return "B"
    elif score >= 70 and score < 80:
        return "C"
    elif score >= 60 and score < 70:
        return "D"
    elif score < 60:
        return "F"

result = get_average(lloyd)

print(get_letter_grade(result))

students = [lloyd, alice, tyler]

def get_class_average(students):
    results = []
    for student in range(len(students)):
        final = get_average(students[student])
        results.append(final)
    return average(results)

print(get_class_average(students))
print(get_letter_grade(get_class_average(students)))

Python类型错误

3 个答案: