matplotlib · QuLogic · Dec 17, 2021 · Dec 17, 2021 · dstansby · Dec 17, 2021
diff --git a/lib/matplotlib/backends/backend_wx.py b/lib/matplotlib/backends/backend_wx.py
@@ -618,7 +618,8 @@ def gui_repaint(self, drawDC=None, origin='WX'):
                else self.bitmap)
         drawDC.DrawBitmap(bmp, 0, 0)
         if self._rubberband_rect is not None:
-            x0, y0, x1, y1 = self._rubberband_rect
+            # Some versions of wx+python don't support numpy.float64 here.
+            x0, y0, x1, y1 = map(int, self._rubberband_rect)
             drawDC.DrawLineList(
                 [(x0, y0, x1, y0), (x1, y0, x1, y1),
                  (x0, y0, x0, y1), (x0, y1, x1, y1)],

diff --git a/lib/matplotlib/tests/test_backends_interactive.py b/lib/matplotlib/tests/test_backends_interactive.py
@@ -128,6 +128,8 @@ def check_alt_backend(alt_backend):
         "matplotlib.backends.backend_{}".format(backend))
 
     ax.plot([0, 1], [2, 3])
+    if fig.canvas.toolbar:  # i.e toolbar2.
+        fig.canvas.toolbar.draw_rubberband(None, 1., 1, 2., 2)
 
     timer = fig.canvas.new_timer(1.)  # Test floats casting to int as needed.
     timer.add_callback(FigureCanvasBase.key_press_event, fig.canvas, "q")