错误：'浮动'的对象是不可迭代的 - python

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] 
} 


def average(numbers): 

    total = sum(numbers) 
    total = float(total) 

    return total/len(numbers) 

def get_average(student): 
    homework = average(student['homework']) 
    quizzes = average(student['quizzes']) 
    tests = average(student['tests']) 
    return sum(homework* 0.1 +\ 
       quizzes * 0.3 +\ 
       tests * 0.6)   

我不知道我在做什么错。

忘了把我得到：“错误：'浮动'不可迭代”。

我应该得到什么，例如：

get_average（爱丽丝）：91.15。

Answer 1

sum内置函数期望数字序列总和为一个参数。你只给它一个数字。在这种情况下，你并不需要在所有调用sum功能：

return homework* 0.1 +\ 
     quizzes * 0.3 +\ 
     tests * 0.6 

或者，使用sum正确：

return sum([homework* 0.1, 
      quizzes * 0.3, 
      tests * 0.6])