Added general Renderer.notebook_context attribute

holoviews/ipython/__init__.py

@@ -221,6 +221,7 @@ def __call__(self, *args, **params):
         resources = list(resources)
         if len(resources) == 0: return
 
+        Renderer.load_nb()
         for r in [r for r in resources if r != 'holoviews']:
             Store.renderers[r].load_nb(inline=p.inline)
 

holoviews/plotting/mpl/plot.py

@@ -138,7 +138,7 @@ def __init__(self, fig=None, axis=None, **params):
         if self.renderer.interactive:
             plt.ion()
             self._close_figures = False
-        elif not self.renderer._notebook:
+        elif not self.renderer.notebook_context:
             plt.ioff()
 
         with mpl.rc_context(rc=self.fig_rcparams):

holoviews/plotting/mpl/renderer.py

@@ -93,9 +93,6 @@ class MPLRenderer(Renderer):
              'nbagg':   (NbAggJupyterComm, None),
              'mpld3':   (JupyterComm, mpld3_msg_handler)}
 
-    # Whether in a notebook context
-    _notebook = False
-
     def __call__(self, obj, fmt='auto'):
         """
         Render the supplied HoloViews component or MPLPlot instance
@@ -321,4 +318,3 @@ def load_nb(cls, inline=True):
         """
         import matplotlib.pyplot as plt
         plt.switch_backend('agg')
-        cls._notebook = True

holoviews/plotting/renderer.py

@@ -150,6 +150,9 @@ class Renderer(Exporter):
     # Any additional JS and CSS dependencies required by a specific backend
     backend_dependencies = {}
 
+    # Whether in a notebook context, set when running Renderer.load_nb
+    notebook_context = False
+
     def __init__(self, **params):
         self.last_plot = None
         super(Renderer, self).__init__(**params)
@@ -516,3 +519,6 @@ def load_nb(cls, inline=True):
         Loads any resources required for display of plots
         in the Jupyter notebook
         """
+        with param.logging_level('ERROR'):
+            cls.notebook_context = True
+