X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/920a9b20de934454768a43ce6d8a8d8ff4ca0840..3fa6aa4043286ad61e5f29c136d3cc2942e8750d:/sdk/cwl/arvados_cwl/perf.py

diff --git a/sdk/cwl/arvados_cwl/perf.py b/sdk/cwl/arvados_cwl/perf.py
index 64fda59aa0..cc3ea969df 100644
--- a/sdk/cwl/arvados_cwl/perf.py
+++ b/sdk/cwl/arvados_cwl/perf.py
@@ -1,3 +1,9 @@
+# Copyright (C) The Arvados Authors. All rights reserved.
+#
+# SPDX-License-Identifier: Apache-2.0
+
+from builtins import object
+
 import time
 import uuid
 
@@ -10,6 +16,6 @@ class Perf(object):
         self.time = time.time()
         self.logger.debug("ENTER %s %s", self.name, self.time)
 
-    def __exit__(self, exc_type, exc_value, traceback):
+    def __exit__(self, exc_type=None, exc_value=None, traceback=None):
         now = time.time()
         self.logger.debug("EXIT %s %s %s", self.name, now, now - self.time)