Added ``Element.__contains__`` method, for the in-operator.

git-svn-id: http://svn.code.sf.net/p/docutils/code/trunk/docutils/docutils@5601 929543f6-e4f2-0310-98a6-ba3bd3dd1d04

1 files changed, 3 insertions, 0 deletions

diff --git a/nodes.py b/nodes.py
index ffb679b17..30050a121 100644
--- a/nodes.py
+++ b/nodes.py
@@ -550,6 +550,9 @@ class Element(Node):
 
     has_key = hasattr
 
+    # support operator in
+    __contains__ = hasattr
+
     def append(self, item):
         self.setup_child(item)
         self.children.append(item)