new_contents: # -*- encoding: utf-8 -*-
  
  
  def quick_sort(st_bf):
      print st_bf
      if len(st_bf) > 1:
          temp = st_bf[0]
          st_now = quick_sort([i for i in st_bf[1:] if i < temp]) + \
              [temp] + \
              quick_sort([j for j in st_bf[1:] if j >= temp])
          return st_now
      else:
          return st_bf
  
  
  st_bf = [4, 5, 9, 2, 6, 8, 2, 1, 7, 3]
  print quick_sort(st_bf)
  
subject: add quick_sort.py