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

def lastmax_array():
   A = [23,22,89,24,45,26,72,81,89,55,900,889,225,900,900,899]
   i = 0
   maxnum = 0
 
   while(i<len(A)):
        if(maxnum <= A[i]):
           maxnum = A[i]
           x = i
        i = i+1
   print(maxnum,"A[",x,"]")
 
lastmax_array()