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-rw-r--r--numpy/lib/tests/test_io.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/numpy/lib/tests/test_io.py b/numpy/lib/tests/test_io.py
index aee727efa..6ccfa818c 100644
--- a/numpy/lib/tests/test_io.py
+++ b/numpy/lib/tests/test_io.py
@@ -8,7 +8,7 @@ import sys
MAJVER, MINVER = sys.version_info[:2]
-class RoundtripTest:
+class RoundtripTest(object):
def roundtrip(self, save_func, *args, **kwargs):
"""
save_func : callable