From 86f31edd01cad38f714538bbd9f41997dae60b88 Mon Sep 17 00:00:00 2001
From: Gunnar Aastrand Grimnes <gromgull@gmail.com>
Date: Thu, 12 Jan 2017 12:35:28 +0100
Subject: [PATCH] be more compatible when importing elementtree, and only in
 one place

fixes #606
---
 rdflib/compat.py                            | 27 +++++++++++++++++++++
 rdflib/plugins/sparql/results/xmlresults.py |  4 +--
 rdflib/plugins/stores/sparqlstore.py        | 27 ++++-----------------
 3 files changed, 34 insertions(+), 24 deletions(-)

diff --git a/rdflib/compat.py b/rdflib/compat.py
index 6c7148949..f7ca4063b 100644
--- a/rdflib/compat.py
+++ b/rdflib/compat.py
@@ -23,3 +23,30 @@ def numeric_greater(a, b):
 
     def numeric_greater(a, b):
         return a > b
+
+
+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")
diff --git a/rdflib/plugins/sparql/results/xmlresults.py b/rdflib/plugins/sparql/results/xmlresults.py
index 85c33882e..b31f9513b 100644
--- a/rdflib/plugins/sparql/results/xmlresults.py
+++ b/rdflib/plugins/sparql/results/xmlresults.py
@@ -3,7 +3,7 @@
 from xml.dom import XML_NAMESPACE
 from xml.sax.xmlreader import AttributesNSImpl
 
-from xml.etree import cElementTree as ElementTree
+from rdflib.compat import etree
 
 from rdflib import Literal, URIRef, BNode, Graph, Variable
 from rdflib.query import (
@@ -42,7 +42,7 @@ def __init__(self, source):
         if isinstance(xmlstring, unicode):
             xmlstring = xmlstring.encode('utf-8')
         try:
-            tree = ElementTree.fromstring(xmlstring)
+            tree = etree.fromstring(xmlstring)
         except Exception, e:
             try:
                 raise e.__class__("error parsing %r: %s" % (xmlstring, e))
diff --git a/rdflib/plugins/stores/sparqlstore.py b/rdflib/plugins/stores/sparqlstore.py
index 25cfb61dc..481f68405 100644
--- a/rdflib/plugins/stores/sparqlstore.py
+++ b/rdflib/plugins/stores/sparqlstore.py
@@ -13,7 +13,6 @@
 
 import re
 import collections
-import urllib2
 import warnings
 
 try:
@@ -23,20 +22,7 @@
         "SPARQLWrapper not found! SPARQL Store will not work." +
         "Install with 'easy_install SPARQLWrapper'")
 
-import sys
-if getattr(sys, 'pypy_version_info', None) is not None \
-    or sys.platform.startswith('java') \
-        or sys.version_info[:2] < (2, 6):
-    # import elementtree as etree
-    from elementtree import ElementTree
-    assert ElementTree
-else:
-    try:
-        from xml.etree import ElementTree
-        assert ElementTree
-    except ImportError:
-        from elementtree import ElementTree
-
+from rdflib.compat import etree
 from rdflib.plugins.stores.regexmatching import NATIVE_REGEX
 
 from rdflib.store import Store
@@ -45,9 +31,6 @@
 from rdflib.graph import DATASET_DEFAULT_GRAPH_ID
 from rdflib.term import Node
 
-import httplib
-import urlparse
-
 class NSSPARQLWrapper(SPARQLWrapper):
     nsBindings = {}
 
@@ -89,7 +72,7 @@ def injectPrefixes(self, query):
 BNODE_IDENT_PATTERN = re.compile('(?P<label>_\:[^\s]+)')
 SPARQL_NS = Namespace('http://www.w3.org/2005/sparql-results#')
 sparqlNsBindings = {u'sparql': SPARQL_NS}
-ElementTree._namespace_map["sparql"] = SPARQL_NS
+etree._namespace_map["sparql"] = SPARQL_NS
 
 
 def _node_from_result(node):
@@ -418,7 +401,7 @@ def triples(self, (s, p, o), context=None):
         self.timeout = self._timeout
         self.setQuery(query)
 
-        doc = ElementTree.parse(SPARQLWrapper.query(self).response)
+        doc = etree.parse(SPARQLWrapper.query(self).response)
         # ElementTree.dump(doc)
         for rt, vars in _traverse_sparql_result_dom(
                 doc,
@@ -449,7 +432,7 @@ def __len__(self, context=None):
             if self._is_contextual(context):
                 self.addParameter("default-graph-uri", context.identifier)
             self.setQuery(q)
-            doc = ElementTree.parse(SPARQLWrapper.query(self).response)
+            doc = etree.parse(SPARQLWrapper.query(self).response)
             rt, vars = iter(
                 _traverse_sparql_result_dom(
                     doc,
@@ -485,7 +468,7 @@ def contexts(self, triple=None):
         else:
             self.setQuery('SELECT ?name WHERE { GRAPH ?name {} }')
 
-        doc = ElementTree.parse(SPARQLWrapper.query(self).response)
+        doc = etree.parse(SPARQLWrapper.query(self).response)
 
         return (
             rt.get(Variable("name"))