diff --git a/tools_numpy.ipynb b/tools_numpy.ipynb
index 2c509f6..9a27cd8 100644
--- a/tools_numpy.ipynb
+++ b/tools_numpy.ipynb
@@ -850,7 +850,7 @@
     }
    ],
    "source": [
-    "if (hasattr(f.data, \"tobytes\")):\n",
+    "if hasattr(f.data, \"tobytes\"):\n",
     "    data_bytes = f.data.tobytes() # python 3\n",
     "else:\n",
     "    data_bytes = memoryview(f.data).tobytes() # python 2\n",