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-rw-r--r--sphinx/ext/inheritance_diagram.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/sphinx/ext/inheritance_diagram.py b/sphinx/ext/inheritance_diagram.py
index e134bd753..634c7b5dc 100644
--- a/sphinx/ext/inheritance_diagram.py
+++ b/sphinx/ext/inheritance_diagram.py
@@ -227,7 +227,7 @@ class InheritanceGraph:
if module in ('__builtin__', 'builtins'):
fullname = cls.__name__
else:
- fullname = '%s.%s' % (module, cls.__qualname__)
+ fullname = f'{module}.{cls.__qualname__}'
if parts == 0:
result = fullname
else: