From c426f046df62101be80d876dc8ad79408dd18e5b Mon Sep 17 00:00:00 2001
From: Jake Vanderplas <jakevdp@gmail.com>
Date: Mon, 26 Aug 2019 15:54:29 -0700
Subject: [PATCH 1/2] Do not hard-code matplotlib backend for boxplot

---
 pandas/plotting/_core.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/plotting/_core.py b/pandas/plotting/_core.py
index 2e6a401b49efc..057180125d6ca 100644
--- a/pandas/plotting/_core.py
+++ b/pandas/plotting/_core.py
@@ -375,7 +375,7 @@ def boxplot(
         >>> type(boxplot)
         <class 'numpy.ndarray'>
     """
-    plot_backend = _get_plot_backend("matplotlib")
+    plot_backend = _get_plot_backend()
     return plot_backend.boxplot(
         data,
         column=column,

From 5a2c5c8c0079030e408623f531e319d8422defc8 Mon Sep 17 00:00:00 2001
From: Jake Vanderplas <jakevdp@gmail.com>
Date: Tue, 27 Aug 2019 07:15:54 -0700
Subject: [PATCH 2/2] Hard-code matplotlib backend for deprecated vizualization
 tools.

---
 pandas/plotting/_core.py | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/pandas/plotting/_core.py b/pandas/plotting/_core.py
index 057180125d6ca..2572650c7c52b 100644
--- a/pandas/plotting/_core.py
+++ b/pandas/plotting/_core.py
@@ -70,7 +70,7 @@ def hist_series(
     --------
     matplotlib.axes.Axes.hist : Plot a histogram using matplotlib.
     """
-    plot_backend = _get_plot_backend()
+    plot_backend = _get_plot_backend("matplotlib")
     return plot_backend.hist_series(
         self,
         by=by,
@@ -180,7 +180,7 @@ def hist_frame(
         ...     }, index=['pig', 'rabbit', 'duck', 'chicken', 'horse'])
         >>> hist = df.hist(bins=3)
     """
-    plot_backend = _get_plot_backend()
+    plot_backend = _get_plot_backend("matplotlib")
     return plot_backend.hist_frame(
         data,
         column=column,
@@ -375,7 +375,7 @@ def boxplot(
         >>> type(boxplot)
         <class 'numpy.ndarray'>
     """
-    plot_backend = _get_plot_backend()
+    plot_backend = _get_plot_backend("matplotlib")
     return plot_backend.boxplot(
         data,
         column=column,
@@ -405,7 +405,7 @@ def boxplot_frame(
     return_type=None,
     **kwds
 ):
-    plot_backend = _get_plot_backend()
+    plot_backend = _get_plot_backend("matplotlib")
     return plot_backend.boxplot_frame(
         self,
         column=column,
@@ -484,7 +484,7 @@ def boxplot_frame_groupby(
     >>> grouped = df.unstack(level='lvl1').groupby(level=0, axis=1)
     >>> boxplot_frame_groupby(grouped, subplots=False)
     """
-    plot_backend = _get_plot_backend()
+    plot_backend = _get_plot_backend("matplotlib")
     return plot_backend.boxplot_frame_groupby(
         grouped,
         subplots=subplots,