new_contents: #!/usr/bin/env python
  
  import unittest
  
  def bubble_sort(list):
      """Sort list in place using bubble sort"""
      N = len(list)
      for i in xrange(N, 0, -1):
          # list[i:] is sorted
          for j in xrange(i, N):
              if list[j] < list[j-1]:
                  tmp = list[j-1]
                  list[j-1] = list[j]
                  list[j] = tmp
  
  
  class TestBubble(unittest.TestCase):
      def test_empty(self):
          l = []
          bubble_sort(l)
          self.assertEqual(l, [])
  
      def test_one(self):
          l = [1,2]
          bubble_sort(l)
          self.assertEqual(l, [1,2])
  
      def test_onerev(self):
          l = [2,1]
          bubble_sort(l)
          self.assertEqual(l, [1,2])
  
      def test_many(self):
          l = [-3, 4, 5, 1.9, 1, 8, 324, -3, 43]
          lsort = sorted(l)
          bubble_sort(l)
          self.assertEqual(l, lsort)
  
  if __name__ == "__main__":
      unittest.main()
  
subject: Add bubble_sort