chore(gae): delete regions from migration/ndb/overview/main.py (#13078)

* chore(gae): delete regions from migration/ndb/overview/main.py

* chore(gae): add support for Python 3 to requirements-test.txt

* chore(gae): fix whitespace in templates/index.html

* docs(gae): update README.md to a current Python 3 sample

Author: eapl-gemugami

appengine/standard/migration/ndb/overview/README.md

@@ -11,11 +11,6 @@ with the [Google Cloud NDB library](https://googleapis.dev/python/python-ndb/lat
 This library can be used not only on App Engine, but also other Python 3
 platforms.
 
-To deploy and run this sample in App Engine standard for Python 2.7:
-
-    pip install -t lib -r requirements.txt
-    gcloud app deploy
-
-To deploy and run this sample in App Engine standard for Python 3.7:
+To deploy and run this sample in App Engine standard for Python 3.8:
 
     gcloud app deploy app3.yaml

appengine/standard/migration/ndb/overview/main.py

@@ -12,7 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-# [START all]
 from flask import Flask, redirect, render_template, request
 from google.cloud import ndb
 
@@ -25,15 +24,12 @@
 client = ndb.Client()
 
 
-# [START greeting]
 class Greeting(ndb.Model):
     """Models an individual Guestbook entry with content and date."""
 
     content = ndb.StringProperty()
     date = ndb.DateTimeProperty(auto_now_add=True)
-    # [END greeting]
 
-    # [START query]
     with client.context():
 
         @classmethod
@@ -48,7 +44,6 @@ def display_guestbook():
     with client.context():
         ancestor_key = ndb.Key("Book", guestbook_name or "*notitle*")
         greetings = Greeting.query_book(ancestor_key).fetch(20)
-    # [END query]
 
     greeting_blockquotes = [greeting.content for greeting in greetings]
     return render_template(
@@ -58,7 +53,6 @@ def display_guestbook():
     )
 
 
-# [START submit]
 @app.route("/sign", methods=["POST"])
 def update_guestbook():
     # We set the parent key on each 'Greeting' to ensure each guestbook's
@@ -73,12 +67,10 @@ def update_guestbook():
             content=request.form.get("content", None),
         )
         greeting.put()
-    # [END submit]
 
     return redirect("/?" + urlencode({"guestbook_name": guestbook_name}))
 
 
 if __name__ == "__main__":
     # This is used when running locally.
     app.run(host="127.0.0.1", port=8080, debug=True)
-# [END all]

appengine/standard/migration/ndb/overview/requirements-test.txt

@@ -1,2 +1,6 @@
 # pin pytest to 4.6.11 for Python2.
 pytest==4.6.11; python_version < '3.0'
+
+# pytest==8.3.4 and six==1.17.0 for Python3.
+pytest==8.3.4; python_version >= '3.0'
+six==1.17.0

appengine/standard/migration/ndb/overview/templates/index.html

@@ -43,4 +43,4 @@
         <input type="submit" value="switch" />
     </form>
 </body>
-</html >
+</html>