Avoid DeprecationWarnings for etree

Fixes Python-Markdown#618.

Author: waylan

markdown/extensions/footnotes.py

@@ -202,7 +202,7 @@ def makeFootnotesDiv(self, root):
             )
             backlink.text = FN_BACKLINK_TEXT
 
-            if li.getchildren():
+            if len(li):
                 node = li[-1]
                 if node.tag == "p":
                     node.text = node.text + NBSP_PLACEHOLDER
@@ -393,7 +393,7 @@ def run(self, root):
             result = self.footnotes.findFootnotesPlaceholder(root)
             if result:
                 child, parent, isText = result
-                ind = parent.getchildren().index(child)
+                ind = list(parent).index(child)
                 if isText:
                     parent.remove(child)
                     parent.insert(ind, footnotesDiv)

markdown/treeprocessors.py

@@ -272,8 +272,8 @@ def __applyPattern(self, pattern, data, patternIndex, startIndex=0):
     def __build_ancestors(self, parent, parents):
         """Build the ancestor list."""
         ancestors = []
-        while parent:
-            if parent:
+        while parent is not None:
+            if parent is not None:
                 ancestors.append(parent.tag.lower())
             parent = self.parent_map.get(parent)
         ancestors.reverse()
@@ -303,7 +303,7 @@ def run(self, tree, ancestors=None):
         # to ensure we don't have the user accidentally change it on us.
         tree_parents = [] if ancestors is None else ancestors[:]
 
-        self.parent_map = dict((c, p) for p in tree.getiterator() for c in p)
+        self.parent_map = dict((c, p) for p in tree.iter() for c in p)
         stack = [(tree, tree_parents)]
 
         while stack: