pandas plot interactive

python/helpers/pycharm_matplotlib_backend/backend_interagg.py

@@ -32,6 +32,14 @@ class Show(ShowBase):
 show = Show()
 
 
+# from pyplot API
+def draw_if_interactive():
+    if matplotlib.is_interactive():
+        figManager = Gcf.get_active()
+        if figManager is not None:
+            figManager.canvas.show()
+
+
 # from pyplot API
 def new_figure_manager(num, *args, **kwargs):
     FigureClass = kwargs.pop('FigureClass', Figure)
@@ -61,6 +69,10 @@ class FigureCanvasInterAgg(FigureCanvasAgg):
         else:
             buffer = self.tostring_rgb()
 
+        if len(set(buffer)) <= 1:
+            # do not plot empty
+            return
+
         render = self.get_renderer()
         width, height = int(render.width), int(render.height) # pass to the socket