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-rw-r--r--markdown.py6
1 files 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)))