How to find second largest number in a list?

Question

So I have to find the second largest number from list. I am doing it through simple loops.

My approach is to divide a list into two parts and then find the largest n

Answer 1

Second largest number in the list:

alist=[-45,0,3,10,90,5,-2,4,18,45,100,1,-266,706]
second_highest_number = sorted(list(set(alist)))[-2]

If you only want the 2nd largest element in the list (in cases where the highest value may occur twice), just skip the set() and list() call.

alist=[-45,0,3,10,90,5,-2,4,18,45,100,1,-266,706]
second_highest_number = sorted(alist)[-2]