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-rw-r--r--markdown/preprocessors.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/markdown/preprocessors.py b/markdown/preprocessors.py
index f20f040..55dd9ab 100644
--- a/markdown/preprocessors.py
+++ b/markdown/preprocessors.py
@@ -147,7 +147,7 @@ class HtmlBlockPreprocessor(Preprocessor):
if block[1] == "!":
# is a comment block
- left_tag, left_index, attrs = "--", 2, ()
+ left_tag, left_index, attrs = "--", 2, {}
else:
left_tag, left_index, attrs = self._get_left_tag(block)
right_tag, data_index = self._get_right_tag(left_tag,