demo + utils venv

utils/venv/lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py

@@ -0,0 +1,21 @@
+from . import _backend_tk
+from .backend_agg import FigureCanvasAgg
+from ._backend_tk import (
+    _BackendTk, FigureCanvasTk, FigureManagerTk, NavigationToolbar2Tk)
+
+
+class FigureCanvasTkAgg(FigureCanvasAgg, FigureCanvasTk):
+    def draw(self):
+        super(FigureCanvasTkAgg, self).draw()
+        _backend_tk.blit(self._tkphoto, self.renderer._renderer, (0, 1, 2, 3))
+        self._master.update_idletasks()
+
+    def blit(self, bbox=None):
+        _backend_tk.blit(
+            self._tkphoto, self.renderer._renderer, (0, 1, 2, 3), bbox=bbox)
+        self._master.update_idletasks()
+
+
+@_BackendTk.export
+class _BackendTkAgg(_BackendTk):
+    FigureCanvas = FigureCanvasTkAgg