如何在一行中初始化排序数组而不是创建数组然后对其进行排序？

Question

I have a code like below:

print([i if (ord(i)-97)%2 == 0 else i.upper() for i in input()].sort(reverse=True))

the result of this code is None, I couldn't understand why this happened?

Answer 1

.sort() doesn't return the result. It sorts the given list in place, and so you have no access to it.

Instead, you can use sorted :

print(sorted([i if (ord(i)-97)%2 == 0 else i.upper() for i in input()], reverse=True))

Or call sort on a list you have assigned to a name:

lst = [i if (ord(i)-97)%2 == 0 else i.upper() for i in input()]
lst.sort(reverse=True)

print(lst)