解释功能

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]
}

# Add your function below!
def average(numbers):
    total = sum(numbers)
    total = float(total)
    total /= len(numbers)
    return total
def get_average(student):
    homework = average(student["homework"])
    quizzes = average(student["quizzes"])
    tests = average(student["tests"])
    total = 0.1*homework + 0.3*quizzes + 0.6*tests
    return total
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"

print get_letter_grade(lloyd)

我的问题是，函数getletter如何知道使用函数average和getaverage，如果我们不指定它们的话？我们输入一个字典作为一个函数的参数，这个函数对字典没有任何用处，只用于比较。你知道吗

Answer 1

函数get\u letter\u grade不“知道”如何使用average和get\u average函数。你知道吗

你可能想要达到的目标是：

print get_letter_grade(get_average(lloyd))

或者更容易阅读：

# get lloyds average score
lloyd_score = get_average(lloyd)

# get the letter grade corresponding to lloyd's average score
lloyd_letter_grade = get_letter_grade(lloyd_score)

# print that letter grade
print lloyd_letter_grade