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-rw-r--r--test/log.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/log.py b/test/log.py
index de127fefb27..b0254f9abee 100644
--- a/test/log.py
+++ b/test/log.py
@@ -57,7 +57,7 @@ def get_logger(name):
def get_parallel_logger(stream):
- logger = logging.getLogger('parallel_logger_{}'.format(stream))
+ logger = logging.getLogger('parallel_logger_{!s}'.format(stream))
logger.propagate = False
logger.setLevel(logging.DEBUG)
handler = logging.StreamHandler(stream)