  from nose.tools import assert_equal
  
  
  def height(node):
      if node is None:
          return 0
 
</s> remove                 result.append(curr_word+key)
            self._list_words(child, curr_word+key, result) </s> add  </s> remove     "from nose.tools import assert_equal\n",
 </s> add     "import unittest\n", </s> remove     "from nose.tools import assert_equal\n",
 </s> add     "import unittest\n", </s> remove         self._bubble_up(index=len(self.array)-1)
 </s> add         self._bubble_up(index=len(self.array) - 1) </s> remove from nose.tools import assert_equal
from nose.tools import assert_true
 </s> add import unittest
import unittest
import unittest
  
  
  def height(node):
      if node is None:
          return 0
replace keep keep keep keep keep
 #273: Remove nose dependency for graphs_trees/ (#277) 
graphs_trees/bst_min/test_bst_min.py