Add missing calls to plt.show.

The ipympl backend doesn't display figures automatically, add the
call to plt.show to force display.

Author: zivy

Python/04_Image_Display.ipynb

@@ -259,7 +259,8 @@
     "    \"grey colormap,\\n scaling based on volumetric min and max values\", fontsize=10\n",
     ")\n",
     "plt.imshow(npa_zslice, cmap=plt.cm.Greys_r, vmin=npa.min(), vmax=npa.max())\n",
-    "plt.axis(\"off\");"
+    "plt.axis(\"off\");\n",
+    "plt.show()"
    ]
   },
   {
@@ -321,6 +322,7 @@
     "plt.figure(figsize=(10, 2))\n",
     "plt.imshow(sitk.GetArrayViewFromImage(sitk_isotropic_xslice), cmap=plt.cm.Greys_r)\n",
     "plt.axis(\"off\")\n",
+    "plt.show()\n",
     "print(f\"Image spacing: {sitk_isotropic_xslice.GetSpacing()}\")"
    ]
   },

Python/69_x-ray-panorama.ipynb

@@ -136,7 +136,8 @@
    "source": [
     "intensity_profile_image = knee_image\n",
     "fig = plt.figure()\n",
-    "plt.hist(sitk.GetArrayViewFromImage(intensity_profile_image).flatten(), bins=100);"
+    "plt.hist(sitk.GetArrayViewFromImage(intensity_profile_image).flatten(), bins=100);\n",
+    "plt.show()"
    ]
   },
   {
@@ -180,7 +181,8 @@
     "axes[1].plot(intensities.mean(axis=1), range(intensities.shape[0]))\n",
     "axes[1].get_yaxis().set_visible(False)\n",
     "axes[1].tick_params(axis=\"x\", rotation=-90)\n",
-    "plt.box(on=None)"
+    "plt.box(on=None)\n",
+    "plt.show()"
    ]
   },
   {

Python/gui.py

@@ -99,6 +99,7 @@ def __init__(
             vmax=self.moving_max_intensity,
         )
         self.update_display()
+        plt.show()
 
     def create_ui(self):
         # Create the active UI components. Height and width are specified in 'em' units. This is
@@ -414,6 +415,7 @@ def __init__(self, image, window_level=None, figure_size=(10, 8)):
             vmax=self.max_intensity,
         )
         self.update_display()
+        plt.show()
 
     def create_ui(self):
         # Create the active UI components. Height and width are specified in 'em' units. This is
@@ -624,6 +626,7 @@ def multi_image_display2D(
         ax.set_title(title)
         ax.set_axis_off()
     fig.tight_layout()
+    plt.show()
     return (fig, axes)
 
 
@@ -693,6 +696,7 @@ def __init__(
             )
         self.update_display()
         plt.tight_layout()
+        plt.show()
 
     def create_ui(self, shared_slider, wl_range, wl_init):
         # Create the active UI components. Height and width are specified in 'em' units. This is
@@ -877,6 +881,7 @@ def __init__(self, image, window_level=None, figure_size=(10, 8)):
             vmax=self.max_intensity,
         )
         self.update_display()
+        plt.show()
 
     def create_ui(self):
         # Create the active UI components. Height and width are specified in 'em' units. This is
@@ -1176,6 +1181,7 @@ def __init__(
         self.fig.canvas.mpl_connect("button_release_event", self.on_release)
 
         self.update_display()
+        plt.show()
 
     def create_ui(self):
         # Create the active UI components. Height and width are specified in 'em' units. This is