From 231b7784e66edf8a5fb26ccfd363a82ab2dcc7e2 Mon Sep 17 00:00:00 2001
From: David Wolever <wolever@cs.toronto.edu>
Date: Tue, 26 Feb 2008 18:29:46 +0000
Subject: Removed the rigorous type-checking when loading extensions.  If it
 walks like a duck...

---
 markdown.py | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/markdown.py b/markdown.py
index 709ed50..1681a98 100644
--- a/markdown.py
+++ b/markdown.py
@@ -1235,8 +1235,10 @@ class Markdown:
         for ext in extensions:
             if isinstance(ext, basestring):
                 ext = load_extension(ext, configs.get(ext, []))
-            elif isinstance(ext, Extension):
-                pass # nothing to do here
+            elif hasattr(ext, 'extendMarkdown'):
+                # Looks like an Extension.
+                # Nothing to do here.
+                pass
             else:
                 message(ERROR, "Incorrect type! Extension '%s' is "
                                "neither a string or an Extension." %(repr(ext)))
-- 
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