#usr/bin/env pythondef binary_search(lst,t):  low=0  height=len(lst)-1  quicksort(lst,0,height)  print lst  while low<=height:     mid = (low+height)/2    if lst[mid] == t:      return lst[mid]    elif lst[mid]>t:      height=mid-1    else:      low=mid+1  return -1def quicksort( lst, left , right):  low=left  high=right  key=lst[left]  if left>=right:    return 0  while low<high:    while low<high and key<lst[high]:      high=high-1    lst[low]=lst[high]    while low<high and key>lst[low]:      print lst[low]      low=low+1    lst[high]=lst[low]    lst[low]=key  quicksort( lst , left ,low-1)  quicksort( lst , low+1 , right)if __name__=='__main__':  print binary_search([4,8,1,5,10,2,12,3,6,9],4)