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-rw-r--r--checkers/strings.py8
1 files changed, 4 insertions, 4 deletions
diff --git a/checkers/strings.py b/checkers/strings.py
index 4fe16dd..ad63580 100644
--- a/checkers/strings.py
+++ b/checkers/strings.py
@@ -327,10 +327,10 @@ class StringMethodsChecker(BaseChecker):
self.add_message('bad-format-string', node=node)
return
- manual_fields = {field[0] for field in fields
- if isinstance(field[0], int)}
- named_fields = {field[0] for field in fields
- if isinstance(field[0], str)}
+ manual_fields = set(field[0] for field in fields
+ if isinstance(field[0], int))
+ named_fields = set(field[0] for field in fields
+ if isinstance(field[0], str))
if manual_fields and num_args:
self.add_message('format-combined-specification',
node=node)