计算平均值并确定最低和最高值

Question

我已经拆分了一个包含姓名和相应分数的列表，并将它们存储在一个名为 students 的字典中。但是有了这些分数，我被要求算出平均分、最低分和最高分。我是初学者和学生，因此非常感谢您逐步解释。

def getStatistics(students):

#  Initialize properly the values of the average score, minimum score, and maximum score. 
    average = 0
    lowest = True
    highest = True
    scoreTotal = 0

上面的变量被这样标记的原因是因为在我的主函数中，它调用这个函数，有一个带有这些名称的内置调用。但是每当我去运行程序时，它都不会打印任何内容。

#  loop through the dictionary, and
#  calculate the average score, the highest score and the lowest score
#  of the students in the dictionary.

    i = 0
    for grade in students:
        scoreTotal += grade[i]
        i = i + 1
    average = scoreTotal/i
    lowest = min(grade[i])
    highest = max(grade[i])

#  The function must return back the average, highest and lowest score.
   return average, highest, lowest

在主函数中它有这个：（“nameToMarksMap”是上一部分中的函数与字典学生）

 average, highest, lowest = getStatistics(nameToMarksMap)

 print "Average:", average, "Highest:", highest, "Lowest:", lowest 

什么都没有打印出来，谁能解释一下为什么？我不断收到错误。

Answer 1

完成函数

def getStatistics(students)
    ...
    # snip
    ...
    return average, highest, lowest