python codeacademy发信
python codeacademy发信
提问于 2016-11-24 04:10:34
我正试着从codeacademy的课程开始自学Python，到目前为止一切都很顺利。然而，我在“学生成为老师7/9”中遇到了一个障碍。我找不到讨论这个问题的帖子，但如果我错过了一个，请随时让我知道。
根据codeacademy的说法，我成功地完成了这个练习，但我知道这段代码有问题。当我在repl.it中使用下面的代码时，get_average(学生)返回正确的值。我已经通过更改成绩来测试这一点，只是为了确保这一点--但是get_letter_grade(score)为每个学生返回"A“。我试着更具体地说明允许的数字范围(见下文)，但我总是遇到同样的问题。
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):
total = sum(numbers)
total = float(total)/len(numbers)
return total
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
studentaverage = (homework * .1 + quizzes * .3 + tests *.6)
return studentaverage
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"我还尝试稍微更改一下get_letter_grade(score)函数，使其更具体/更受限制(我可能想错了；我在这方面非常新手)，如下所示：
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"但如上所述，我有相同的问题:无论我如何改变他们的成绩，它都会为每个学生返回"A“。
您愿意分享的任何建议、见解、智慧等都将不胜感激！
谢谢!
回答 1
Stack Overflow用户
发布于 2016-11-24 05:16:03
我尝试了上面的代码，它在没有任何更改的情况下工作得很好。也许如果你能分享你调用函数的方式，我可以解释你可能一直在遵循的错误过程。下面附加的是代码片段及其相应的输出。
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):
total = sum(numbers)
total = float(total)/len(numbers)
return total
def get_average(student):
homework = average(student["homework"])
quizzes = average(student["quizzes"])
tests = average(student["tests"])
studentaverage = (homework * .1 + quizzes * .3 + tests *.6)
return studentaverage
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"
# To calculate the grades of each student
grade_tyler = get_letter_grade(get_average(tyler))
grade_lloyd = get_letter_grade(get_average(lloyd))
grade_alice = get_letter_grade(get_average(alice))
print(grade_lloyd)
print(grade_alice)
print(grade_tyler)输出：
B
一个
C
此外，我还尝试单独调用这些方法，结果与预期一致。
grade_A = get_letter_grade(95)
grade_B = get_letter_grade(85)
grade_C = get_letter_grade(75)
grade_D = get_letter_grade(65)
print(grade_A)
print(grade_B)
print(grade_C)
print(grade_D)输出：
一个
B
C
D
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/40773337
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