我的python代码出错
我的python代码出错
提问于 2017-03-31 16:29:21
我是python的新手，有学习这门语言的强烈愿望。然而，现在我需要有人帮助我目前正在处理的代码，它不断标记这个错误:哦，再试一次。get_average(alice)返回None，而不是预期的91.15
这也是我下面的解决方案的问题:编写一个名为get_average的函数，该函数将学生字典(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，该函数接受一个名为student的参数。创建一个变量家庭作业，存储学生“家庭作业”的平均值()。对“测验”和“测试”重复步骤2。将这三个平均值乘以它们的权重，返回这三个平均值的总和。家庭作业是10%，测验是30%，测试是60%。
我的解决方案是：
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回答 2
Stack Overflow用户
发布于 2017-03-31 18:27:36
或者，您也可以尝试执行以下操作：
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'Stack Overflow用户
发布于 2017-03-31 16:39:22
我已经测试了你的代码，修复了第4行缺少的左括号(looyd测验)，它工作得很好。
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)这段代码在我的Python2.7上打印91.15
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原文链接：
https://stackoverflow.com/questions/43136026
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