          for node in self.array:
              if node.obj is obj:
                  node.key = new_key
                  return node
          return None 
</s> remove    "execution_count": null,
   "metadata": {
    "collapsed": false
   },
 </s> add    "execution_count": 1,
   "metadata": {}, </s> remove class TestHashMap(object):
 </s> add class TestHashMap(unittest.TestCase): </s> remove     "class TestHashMap(object):\n",
 </s> add     "class TestHashMap(unittest.TestCase):\n", </s> remove     "class TestHashMap(object):\n",
 </s> add     "class TestHashMap(unittest.TestCase):\n",
          for node in self.array:
              if node.obj is obj:
                  node.key = new_key
                  return node

keep keep keep keep replace
 #273: Remove nose dependency for arrays_strings/ (#274) 
arrays_strings/priority_queue/priority_queue.py