如何对变量中的整数进行排序？

Question

Please note that this is on Python 3.3

代码如下：

students=int(input("How many student's score do you want to sort? "))
options=input("What do you want to sort: [Names with scores] , [Scores high to low] , [Scores averages] ? ")
options=options.upper()

if options == ("NAMES WITH SCORES") or  options == ("NAME WITH SCORE") or  options == ("NAME WITH SCORES") or options == ("NAMES WITH SCORE"):
    a=[]
    for i in range(0,students):
        name=input("Enter your scores and name: ")
        a.append(name)

    a.sort()
    print("Here are the students scores listed alphabetically")
    print(a)

if options == ("SCORES HIGH TO LOW") or  options == ("SCORE HIGH TO LOW"):
    b=[]
    number=0
    for i in range(0,students):
        number = number+1
        print("Student "+str(number))
        name2=int(input("Enter your first score: "))
        name3=int(input("Enter your second score: "))
        name4=int(input("Enter your third score: "))

        b.append(name2)
        b.append(name3)
        b.append(name4)

    final_score = name2 + name3 + name4
    print (final_score)
    b.sort(final_score)
    print("Student "+str(number) )
    print(b)

代码的结果如下：

>>> 
How many student's score do you want to sort? 2
What do you want to sort: [Names with scores] , [Scores high to low] , [Scores averages] ? scores high to low
Student 1
Enter your first score: 1
Enter your second score: 2
Enter your third score: 3
Student 2
Enter your first score: 3
Enter your second score: 5
Enter your third score: 6
14
Traceback (most recent call last):
  File "H:\GCSE Computing\Task 3\Task 3.py", line 31, in <module>
    b.sort(final_score)
TypeError: must use keyword argument for key function
>>>

我要代码把学生的三个成绩相加，然后对学生的总成绩进行排序，按照名字排序。

例如：（2 名学生）

学生1

分数 1 - 2
得分 2 - 4
得分 3 - 7

(所以总数是13)

学生2

分数 1 - 5
得分 2 - 1
得分 3 - 4

(所以总数是10)

(程序按从高到低的顺序打印)

"Student 1 - 15 , Student 2 - 10"

Answer 1

传递函数排序时需要使用语法 key=final_score:

b.sort(key=final_score)

但是排序方法期望在 中传递 function 而不是 变量，因此通过添加 name2 + name3 + name4 传递 int 值是不会工作。

如果您只想对分数列表进行排序，只需调用 b.sort()

您应该做的是使用 defautdict 并将每个名称用作键并将所有分数存储在列表中：

from collections import defaultdict


d = defaultdict(list)

for _ in range(students):
    name = input("Enter your name: ")
    scores = input("Enter your scores separated by a space: "
    # add all scores for the user to the list
    d[name].extend(map(int,scores.split()))

显示平均值、总计和最大值很简单：

# from statistics import mean will work for python 3.4

for k,v in d.items():
       print("Scores total for {} is {}".format(k,sum(v)))
       print("Scores average for {} is {}".format(k,sum(v)/len(v))) # mean(v) for python 3,4
       print("Highest score  for {} is {}".format(k, max(v)))

打印按最高用户总分排序：

print("The top scoring students from highest to lowest are:")
for k,v in sorted(d.items(),key=lambda x:sum(x[1]),reverse=True):
    print("{} : {}".format(k,sum(v)))

现在你有一个字典，其中学生姓名是键，每个学生的分数都存储在一个列表中。

你真的应该添加一个 try/except 接受用户输入并验证它的格式是否正确。

如何对变量中的整数进行排序？

How to sort integers in a variable?

python

python-3.3