DOC: Fix syntax error in groupby docs

gfyoung · gfyoung · commit 2b8d5567827b · 2018-11-04T13:28:57.000-08:00
Follow-up to pandas-devgh-23394.
diff --git a/doc/source/groupby.rst b/doc/source/groupby.rst
@@ -133,7 +133,7 @@ but the specified columns
 .. ipython:: python
 
    df2 = df.set_index(['A', 'B'])
-   grouped = df2.groupby(level=df2.index.names.difference(['B'])
+   grouped = df2.groupby(level=df2.index.names.difference(['B']))
 
 These will split the DataFrame on its index (rows). We could also split by the
 columns:
