DOC: HelloWorld Colab compatibility

Author: thewtex

examples/Hello3DWorld.ipynb

@@ -9,24 +9,28 @@
    "source": [
     "import sys\n",
     "\n",
-    "!{sys.executable} -m pip install itkwidgets imageio"
+    "!{sys.executable} -m pip install --pre itkwidgets imageio"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": 2,
    "id": "c3c5eb6e",
    "metadata": {},
    "outputs": [],
    "source": [
     "from itkwidgets import view\n",
     "\n",
-    "import imageio.v2 as imageio"
+    "try:\n",
+    "    import imageio.v2 as imageio\n",
+    "except ImportError:\n",
+    "    # Colab\n",
+    "    import imageio"
    ]
   },
   {
    "cell_type": "code",
-   "execution_count": 2,
+   "execution_count": 3,
    "id": "1bc45207",
    "metadata": {},
    "outputs": [],
@@ -36,14 +40,14 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 4,
    "id": "26582452",
    "metadata": {},
    "outputs": [
     {
      "data": {
       "application/javascript": [
-       "window.connectPlugin && window.connectPlugin(\"06b07aba-462c-4dda-971f-55639d05260a\")"
+       "window.connectPlugin && window.connectPlugin(\"b48ca497-8150-4d41-ad45-5dfaf9daf43c\")"
       ],
       "text/plain": [
        "<IPython.core.display.Javascript object>"
@@ -55,7 +59,7 @@
     {
      "data": {
       "text/html": [
-       "<div id=\"1ac749d7-0651-47fa-92e5-4115ab117fa8\"></div>"
+       "<div id=\"d45ae1b1-233a-4f6b-830b-40601ed80560\"></div>"
       ],
       "text/plain": [
        "<IPython.core.display.HTML object>"
@@ -67,10 +71,10 @@
     {
      "data": {
       "text/plain": [
-       "<itkwidgets.viewer.Viewer at 0x7f47fc869f10>"
+       "<itkwidgets.viewer.Viewer at 0x7f5804bfbd60>"
       ]
      },
-     "execution_count": 3,
+     "execution_count": 4,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -82,7 +86,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": null,
    "id": "5ffa3b37-ae13-4c5d-93e1-64d36c99b196",
    "metadata": {},
    "outputs": [],