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

alist = [-45,0,3,10,90,5,-2,4,18,45,100,1,-266,706]
largest = 0
second_largest = 0
for large in alist:
  if second_largest < large:
    second_largest = large

  if largest < large:
    temp = second_largest
    second_largest = largest
    largest = temp

print "First Highest:- %s" %largest
print "Second Highest:- %s" %second_largest