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-rw-r--r--checkers/strings.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/checkers/strings.py b/checkers/strings.py
index e88085d44..8892c2cc0 100644
--- a/checkers/strings.py
+++ b/checkers/strings.py
@@ -181,7 +181,7 @@ def parse_format_method_string(format_string):
if isinstance(keyname, numbers.Number):
# In Python 2 it will return long which will lead
# to different output between 2 and 3
- manual_pos_arg.add(keyname)
+ manual_pos_arg.add(str(keyname))
keyname = int(keyname)
keys.append((keyname, list(fielditerator)))
else: