  from __future__ import print_function
  from nose.tools import assert_equal
  
  
  class TestHeight(object):
  
 
</s> remove     "from __future__ import print_function\n",
 </s> add  </s> remove     "from __future__ import print_function\n",
 </s> add  </s> remove     "    # TODO: Implement me"
 </s> add     "    # TODO: Implement me\n",
    "    pass"

  from nose.tools import assert_equal
  
  
  class TestHeight(object):
  
replace keep keep keep keep keep
 Removed unused import statements, fixed compile error on skeleton challenge code. 
graphs_trees/tree_height/test_height.py