def importEtree():
    try:
      from lxml import etree
      print("running with lxml.etree")
    except ImportError:
      try:
        # Python 2.5
        import xml.etree.cElementTree as etree
        print("running with cElementTree on Python 2.5+")
      except ImportError:
        try:
          # Python 2.5
          import xml.etree.ElementTree as etree
          print("running with ElementTree on Python 2.5+")
        except ImportError:
          try:
            # normal cElementTree install
            import cElementTree as etree
            print("running with cElementTree")
          except ImportError:
            try:
              # normal ElementTree install
              import elementtree.ElementTree as etree
              print("running with ElementTree")
            except ImportError:
              print("Failed to import ElementTree from any known place")


importEtree()

tree = etree.parse('hero.entity')

root = tree.getroot()


print root
print tree


:::::::OUTPUT:::::::

running with cElementTree on Python 2.5+

Traceback (most recent call last):
  File "C:\Users\echelon\Desktop\python\XLMtest.py", line 32, in <module>
    tree = etree.parse('hero.entity')
NameError: name 'etree' is not defined
>>>