Catching AttributeError versus redirecting it to UnsupportedOperation

qiling/os/os.py

@@ -60,16 +60,13 @@ class QlOs:
             # for the standard streams which usually do not support certain operations,
             # such as fileno(). here we use this to determine how we are going to use
             # the environment standard streams
-            
+
             # IDAPython returns True for stdin but False for stdout and stderr so checking
             # all three
-            if not hasattr(sys.stdin, "fileno"):
-                raise UnsupportedOperation
-            if not hasattr(sys.stdout, "fileno"):
-                raise UnsupportedOperation
-            if not hasattr(sys.stderr, "fileno"):
-                raise UnsupportedOperation
-        except UnsupportedOperation:
+            sys.stdin.fileno()
+            sys.stdout.fileno()
+            sys.stderr.fileno()
+        except (UnsupportedOperation, AttributeError):
             # Qiling is used on an interactive shell or embedded python interpreter.
             # if the internal stream buffer is accessible, we should use it
             self._stdin  = getattr(sys.stdin,  'buffer', sys.stdin)