Added missing import in boxplot_frame_groupby example

Author: gsyqax

doc/source/whatsnew/v1.1.0.rst

@@ -804,6 +804,7 @@ Plotting
 - :func:`.plot` for line/bar now accepts color by dictonary (:issue:`8193`).
 - Bug in :meth:`DataFrame.plot.hist` where weights are not working for multiple columns (:issue:`33173`)
 - Bug in :meth:`DataFrame.boxplot` and :meth:`DataFrame.plot.boxplot` lost color attributes of ``medianprops``, ``whiskerprops``, ``capprops`` and ``medianprops`` (:issue:`30346`)
+- Bug in :meth:`DataFrame.boxplot` where there is a missing import in a code example (:issue:`28903`)
 - Bug in :meth:`DataFrame.hist` where the order of ``column`` argument was ignored (:issue:`29235`)
 - Bug in :meth:`DataFrame.plot.scatter` that when adding multiple plots with different ``cmap``, colorbars alway use the first ``cmap`` (:issue:`33389`)
 

pandas/plotting/_core.py

@@ -548,6 +548,7 @@ def boxplot_frame_groupby(
     Examples
     --------
     >>> import itertools
+    >>> from pandas.plotting import boxplot_frame_groupby
     >>> tuples = [t for t in itertools.product(range(1000), range(4))]
     >>> index = pd.MultiIndex.from_tuples(tuples, names=['lvl0', 'lvl1'])
     >>> data = np.random.randn(len(index),4)