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-rw-r--r--setuptools/_distutils/command/check.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/setuptools/_distutils/command/check.py b/setuptools/_distutils/command/check.py
index 9c3523a8..aaf30713 100644
--- a/setuptools/_distutils/command/check.py
+++ b/setuptools/_distutils/command/check.py
@@ -117,7 +117,7 @@ class check(Command):
if line is None:
warning = warning[1]
else:
- warning = '%s (line %s)' % (warning[1], line)
+ warning = '{} (line {})'.format(warning[1], line)
self.warn(warning)
def _check_rst_data(self, data):