Vary fileno attempt exception type to support Python 3

1 files changed, 6 insertions, 1 deletions

diff --git a/python/subunit/__init__.py b/python/subunit/__init__.py
index 146d2c1..7e2f141 100644
--- a/python/subunit/__init__.py
+++ b/python/subunit/__init__.py
@@ -1137,11 +1137,16 @@ def get_default_formatter():
         return sys.stdout
 
 
+if sys.version_info > (3, 0):
+    from io import UnsupportedOperation as _NoFilenoError
+else:
+    _NoFilenoError = AttributeError
+
 def _make_stream_binary(stream):
     """Ensure that a stream will be binary safe. See _make_binary_on_windows."""
     try:
         fileno = stream.fileno()
-    except AttributeError:
+    except _NoFilenoError:
         return
     _make_binary_on_windows(fileno)