minor fixes/updates, upgrade to Python 3.9

Author: wescpy

mod1-flask/main.py

@@ -1,4 +1,4 @@
-# Copyright 2021 Google LLC
+# Copyright 2020 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

mod12-memcache/main.py

@@ -30,8 +30,8 @@ def store_visit(remote_addr, user_agent):
 
 def fetch_visits(limit):
     'get most recent visits'
-    return [v.to_dict() for v in Visit.query().order(
-            -Visit.timestamp).fetch(limit)]
+    return (v.to_dict() for v in Visit.query().order(
+            -Visit.timestamp).fetch(limit))
 
 @app.route('/')
 def root():
@@ -41,11 +41,10 @@ def root():
     visitor = '{}: {}'.format(ip_addr, usr_agt)
     visits = memcache.get('visits')
 
-    # register visit & run DB query if cache empty or new visitor
+    # if cache empty or new visitor, register visit & run DB query
     if not visits or visits[0]['visitor'] != visitor:
         store_visit(ip_addr, usr_agt)
-        visits = fetch_visits(10)
-        memcache.set('visits', visits, HOUR)  # must set() not add() here
+        visits = list(fetch_visits(10))
+        memcache.set('visits', visits, HOUR)  # set() not add()
 
-    # send context to template renderer
     return render_template('index.html', visits=visits)

mod12b-memcache/app.yaml

@@ -12,5 +12,5 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-runtime: python38
+runtime: python39
 app_engine_apis: true

mod1b-flask/app.yaml

@@ -12,5 +12,5 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-runtime: python38
+runtime: python39
 app_engine_apis: true

mod2b-cloudndb/app.yaml

@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-runtime: python38
+runtime: python39

mod3b-datastore/app.yaml

@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-runtime: python38
+runtime: python39

mod6-firestore/app.yaml

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-runtime: python38
+runtime: python39
 
 handlers:
 - url: /.*

mod7b-gaetasks/app.yaml

@@ -12,5 +12,5 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-runtime: python38
+runtime: python39
 app_engine_apis: true

mod9-py3fstasks/app.yaml

@@ -12,4 +12,4 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-runtime: python38
+runtime: python39

mod9-py3fstasks/requirements.txt

@@ -1,3 +1,3 @@
 flask==1.1.2
-google-cloud-firestore==2.2.0
-google-cloud-tasks==2.5.1
+google-cloud-firestore==2.3.4
+google-cloud-tasks==2.7.0