Lab 5 : Find index of (the last) maximum value in array

def setup():
  n=[1,5,10,4,6,8,7,10,1,1,9,1]
  print("the last index of maximum number = ",lastIndex(n))
  
def lastIndex(n):   
  i=len(n)-1
  index=0
  max_n=n[i]
  while(i>0):
    
     if(max_n<n[i]):
        max_n=n[i]
        index=i
     i=i-1      
  return index        
setup()