Fix AttributeError on Python 3.9 due to usage of removed API in xml (#492)

* Fix usage of deprecated method on ElementTree or Element
These are covered by tests.

* Two more getchildren to just iteration (not covered by tests)

Author: kitchoi

enable/savage/compliance/viewer.py

@@ -68,7 +68,7 @@ def addElementToTree(self, element, node):
             node = self.AppendItem(node, txt)
             self.SetPyData(node, element)
         #children
-        for child in element.getchildren():
+        for child in element:
             self.addElementToTree(child, node)
         #attributes
         for key, value in element.items():

enable/savage/svg/document.py

@@ -302,7 +302,7 @@ def findIDs(self, element, uri=''):
         attribute it may be given.
         """
         idmap = {}
-        for e in element.getiterator():
+        for e in element.iter():
             id = e.get('id', None)
             if id is not None:
                 idmap[(uri, id)] = e
@@ -468,7 +468,7 @@ def addGroupToDocument(self, node):
         path = self.renderer.makePath()
         ops.extend(self.createTransformOpsFromNode(node))
         ops.extend(self.createTransformOpsFromXY(node))
-        for child in node.getchildren():
+        for child in node:
             cpath, cops = self.processElement(child)
             if cpath:
                 path.AddPath(cpath)
@@ -653,7 +653,7 @@ def addRectToDocument(self, node, path):
             clip_path = self.renderer.makePath()
             ops.extend(self.createTransformOpsFromNode(element))
             ops.extend(self.generatePathOps(clip_path))
-            for child in element.getchildren():
+            for child in element:
                 cpath, cops = self.processElement(child)
                 if cpath:
                     clip_path.AddPath(cpath)

kiva/tests/test_svg_drawing.py

@@ -17,7 +17,7 @@ def draw_and_check(self):
         filename = "{0}.svg".format(self.filename)
         self.gc.save(filename)
         tree = ElementTree.parse(filename)
-        elements = [element for element in tree.getiterator()]
+        elements = [element for element in tree.iter()]
         if not len(elements) in [4, 7]:
             self.fail('The expected number of elements was not found')