def __init__(self, xpath_to_nodes, xml_style):
    self.xpath_to_nodes = xpath_to_nodes
    assert xml_style in (self.ELEMENT_CENTRIC, self.ATTRIBUTE_CENTRIC)
    self.xml_style = xml_style
    self.output_stream = None
    self.bulkload_state = None
    self.depth = 0


    if re.match(NODE_PATH_ONLY_RE, xpath_to_nodes):
      self.node_list = self.xpath_to_nodes.split('/')[1:]
      self.entity_node = self.node_list[-1]
      self.node_list = self.node_list[:-1]
    else:
      self.node_list = None
      self.entity_node = None
      self.node_list = None
Negative Index element access (character types)
dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/ext/bulkload/simplexml_connector.py/SimpleXmlConnector.__init__--crossover with--dataset/ETHPy150Open PyTables/PyTables/tables/tests/test_lists.py/GetItemTestCase.test06_negativeIndex