add Python 3 support for Mod 16 app

Author: wescpy

README.md

@@ -114,7 +114,7 @@ Module | Topic | Video | Codelab | START here | FINISH here
 13|Migrate to Cloud Memorystore| _TBD_ | _TBD_ | Module 12 [code](/mod12-memcache) (2.x) & [code](/mod12b-memcache) (3.x) | Module 13 [code](/mod13a-memorystore) (2.x) & [code](/mod13b-memorystore) (3.x)
 14|Migrate service between projects| _TBD_ | _TBD_ | _TBD_ | _TBD_
 15|Add App Engine `blobstore`| _TBD_ | _TBD_ | Module 0 [code](/mod0-baseline) (2.x) | Module 15 [code](/mod15-blobstore) (2.x)
-16|Migrate to Cloud Storage| _TBD_ | _TBD_ | Module 15 [code](/mod15-blobstore) (2.x) | Module 16 [code](/mod16a-cloudstorage) (2.x)
+16|Migrate to Cloud Storage| _TBD_ | _TBD_ | Module 15 [code](/mod15-blobstore) (2.x) | Module 16 [code](/mod16-cloudstorage) (2.x & 3.x)
 
 
 ### Table of contents

mod16a-cloudstorage/.gcloudignore renamed to mod16-cloudstorage/.gcloudignore

@@ -7,3 +7,8 @@ This repo folder is the corresponding code to the [Module 16 codelab](http://g.c
 1. Migrate from App Engine `blobstore` to Cloud Storage
 
 The reason why the web framework requires migration is because `blobstore` has dependencies on `webapp` and `webapp2`, so we could not start directly from a Flask app.
+
+This app is fully Python 2-3 compatible. To do a Python 3 deployment of this app:
+
+1. Edit `app.yaml` by enabling/uncommenting the `runtime: python39` line
+1. Delete all other lines in `app.yaml`, save, and deploy with `gcloud app deploy`

mod16a-cloudstorage/README.md renamed to mod16-cloudstorage/README.md

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+#runtime: python39
 runtime: python27
 threadsafe: yes
 api_version: 1