Resolve matplotlib cleanup issue

Author: rhshadrach

pandas/conftest.py

@@ -1951,8 +1951,8 @@ def ip():
     return InteractiveShell(config=c)
 
 
-@pytest.fixture
-def mpl_cleanup():
+@pytest.fixture(autouse=True)
+def mpl_cleanup(doctest_namespace):
     """
     Ensure Matplotlib is cleaned up around a test.
 

pandas/plotting/_core.py

@@ -621,20 +621,29 @@ def boxplot_frame(
     returned by `boxplot`.  When ``return_type='axes'`` is selected,
     the matplotlib axes on which the boxplot is drawn are returned:
 
+    .. plot::
+        :context: close-figs
+
         >>> boxplot = df.boxplot(column=["Col1", "Col2"], return_type="axes")
         >>> type(boxplot)
         <class 'matplotlib.axes._axes.Axes'>
 
     When grouping with ``by``, a Series mapping columns to ``return_type``
     is returned:
 
+    .. plot::
+        :context: close-figs
+
         >>> boxplot = df.boxplot(column=["Col1", "Col2"], by="X", return_type="axes")
         >>> type(boxplot)
         <class 'pandas.Series'>
 
     If ``return_type`` is `None`, a NumPy array of axes with the same shape
     as ``layout`` is returned:
 
+    .. plot::
+        :context: close-figs
+
         >>> boxplot = df.boxplot(column=["Col1", "Col2"], by="X", return_type=None)
         >>> type(boxplot)
         <class 'numpy.ndarray'>