Question

我是python的新手，非常渴望学习这门语言。但是，现在我需要有人帮助我正在处理的代码，并继续标记此错误：哎呀，再试一次。 get_average（alice）返回None而不是预期的91.15

以下是我的解决方案的问题：编写一个名为get_average的函数，它将学生字典（如劳埃德，爱丽丝或泰勒）作为输入并返回他/她的加权平均值。

定义一个名为get_average的函数，它接受一个名为student的参数。做一个可变的家庭作业，存储学生的平均值（＆＃34;作业＆＃34;]。重复步骤2进行＆＃34;测验＆＃34;和＆＃34;测试＆＃34;。将3个平均值乘以它们的权重并返回这三个的总和。作业为10％，测验为30％，测试为60％。

我的解决方案：

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(student):
    homework = average(student["homework"])
    quizzes = average(student["quizzes"])
    tests = average(student["tests"])
    Av = (0.1 * homework) + (0.6 * tests) +(0.3 * quizzes)
    print Av

Answer 1

或者，你也可以试试这个：

import numpy as np
def weighted_average(d):
 """Returns weighted average of values corresponding to keys homework, 
    tests & quizzes of a dictionary d"""

    # bind dict keys to variables homework, test, quiz
    homework, test, quiz = [d["homework"]], [d["tests"]], [d["quizzes"]]
    # calculate average through np.mean() and Return the value
    return "Average: {}".format((0.1 * np.mean(homework)) + (0.6 * np.mean(test)) + (0.3 * np.mean(quiz)))    

d = lloyd = {"name": "Lloyd","homework": [90.0, 97.0, 75.0, 92.0],"quizzes": [88.0, 40.0, 94.0],"tests": [75.0, 90.0]}
averages(d)

>>>'Average: 80.55'

Answer 2

我已经测试了您的代码，修复了第4行（looyd测验）中缺少的左括号，并且它运行良好。

    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(student):
        homework = average(student["homework"])
        quizzes = average(student["quizzes"])
        tests = average(student["tests"])
        Av = (0.1 * homework) + (0.6 * tests) +(0.3 * quizzes)
        print Av

    get_average(alice)

此代码在我的python 2.7上打印91.15

我的python代码出错

2 个答案: