Update Lib/test/test_sys.py

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@innova.no>

Author: pablogsal

Lib/test/test_sys.py

@@ -1526,8 +1526,8 @@ def write(self, s):
     1/0
 """
         rc, out, err = assert_python_failure('-c', code)
-        self.assertEqual(out, "")
-        self.assertEqual(err, "")
+        self.assertEqual(out, b"")
+        self.assertEqual(err, b"")
 
 if __name__ == "__main__":
     unittest.main()