python codeacademy发送一封信

我想教自己Python开始codeacademy的课程，到目前为止它一直好。然而，我在学生成为教师7/9时遇到了困难。我无法找到讨论这个问题的线索，但是如果我错过了一个，请随时让我知道。python codeacademy发送一封信

根据codeacademy我成功完成了这个练习，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（student）会返回正确的值。我已经通过稍微改变成绩进行了测试 - 但get_letter_grade（分数）为每个学生返回“A”。我试着对允许的数字范围进行更具体的描述（见下文），但我仍然有同样的问题。

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"

我也试图改变get_letter_grade（分数）的作用有点，使其更加具体的/受限制的（我可能会想走错了路，我很新在这），如下：

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，我有同样的问题：无论我如何改变他们的成绩，它都会为每个学生返回“A”。

任何意见，见解，智慧等你关心分享将非常感激！

谢谢！

来源

2016-11-23 user7201984

你在哪里使用'get_letter_score'功能？ – rassar

我试过上面的代码，它没有任何改变就能很好地工作。也许如果你可以分享你调用函数的方式，我可以对你可能一直遵循的错误程序进行阐述。下面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：

乙

甲

另外我还试图单独地调用方法并如预期的结果。

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：

甲

乙

来源

2016-11-23 21:16:02

python codeacademy发送一封信

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