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-rw-r--r--sphinx/util/compat.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/util/compat.py b/sphinx/util/compat.py
index 4d5e1996..56ac9e80 100644
--- a/sphinx/util/compat.py
+++ b/sphinx/util/compat.py
@@ -27,7 +27,7 @@ def make_admonition(node_class, name, arguments, options, content, lineno,
textnodes, messages = state.inline_text(title_text, lineno)
admonition_node += nodes.title(title_text, '', *textnodes)
admonition_node += messages
- if options.has_key('class'):
+ if 'class' in options:
classes = options['class']
else:
classes = ['admonition-' + nodes.make_id(title_text)]