从一组数据中计算最大值

Question

我目前正在开发一个代码，它可以根据用户的选择对 csv 文件中的数据进行排序。

目前我遇到了麻烦，因为我的最高分排序并没有真正起作用。它将 10 识别为 010，因此推断它小于 09 等其他数字。有什么办法可以解决这个问题吗？

http://postimg.org/image/onfbhpaxn/这是我目前得到的结果

这是我用来锻炼最高分的代码。

high = max(int(x) for x in row[2:4]) # finds the highest score from the row 2:4
high = str("0") + str(high) # adds a 0 in front of the high score so that it could be used for sorting
row.insert( 6, high) #insert the high value on row 6
write.writerows([row[:7]])

这是我用来排序的代码。

 if choice == 2: #if choice is 2
     form = input("Enter a class to sort it's Data: ") 
     filename = 'class{}.csv'.format(form)
     print("• Enter 1 to sort by student's highest score in alphabetical order. ")
     print("• Enter 2 to sort by student's highest score (highest to lowest)")
     print("• Enter 3 to sort by Student's average score (highest to lowest)")
     sorttype = int(input("Choose a option from above to sort: "))  # ask the teacher to choose an option for the sorting from above
     print("                                                                                       ")  #prints out nothing (space ) so that the sorted data is layed out in a neater way 
     with open (filename,'r', newline='') as keerthan: #open the file to read using csv writer
         read = csv.reader(keerthan,delimiter=',') #creates a function to read lines in the sort file
         if sorttype == 1: sorting = sorted(read, key=operator.itemgetter(0,6)) # if the student choses 1 ; sort it in alphabetical order
         elif sorttype == 2:sorting = sorted(read, key=operator.itemgetter(6,0), reverse = True) #if choice 2 , sort it is lowest to highest and then reverse.
         elif sorttype == 3:sorting = sorted(read, key=operator.itemgetter(5,0), reverse = True) # if choice 3 , sort by average score ; lowest to highest and then reverse.
         for row in sorting: # for every row in the file
             if row[0].startswith("Name"):None #if the first column is "name" (like the header): skip it

             else: #else (otherwise)
                 if sorttype == 3: print(row[0] + ' ' + row[1] + ': ' + row[5]) #otherwise print FirstName, SecondName and average score

                 else:print(row[0] + ' ' + row[1] + ': ' + row[6])

谢谢。

Answer 1

由于您要做的是根据数字进行排序，因此您应该让key 函数将您想要的值转换为整数。下面是一个帮助您入门的示例：

values = [('Alice', '80'), ('Bob', '5'), ('Chuck', '80')]
sorted(values, key = lambda row: (-int(row[1]), row[0]))