Added samples from datastore-samples

datastore/ndb/overview/README.md

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+## NDB Overview Sample
+
+This is a sample app for Google App Engine that exercises the [NDB Python API](https://cloud.google.com/appengine/docs/python/ndb/).
+
+See our other [Google Cloud Platform github
+repos](https://github.com/GoogleCloudPlatform) for sample applications and
+scaffolding for other python frameworks and use cases.
+
+## Run Locally
+1. Install the [Google Cloud SDK](https://cloud.google.com/sdk/), including the [gcloud tool](https://cloud.google.com/sdk/gcloud/), and [gcloud app component](https://cloud.google.com/sdk/gcloud-app).
+2. Setup the gcloud tool.
+
+   ```
+   gcloud components update app
+   gcloud auth login
+   gcloud config set project <your-app-id>
+   ```
+   You don't need a valid app-id to run locally, but will need a valid id to deploy below.
+
+1. Clone this repo.
+
+   ```
+   git clone https://github.com/GoogleCloudPlatform/datastore-pthon-samples.git
+   cd datastore-python-samples/ndb-overview
+   ```
+1. Run this project locally from the command line.
+
+   ```
+   gcloud preview app run ./
+   ```
+
+1. Visit the application at [http://localhost:8080](http://localhost:8080).
+
+## Deploying
+
+1. Use the [Cloud Developer Console](https://console.developer.google.com)  to create a project/app id. (App id and project id are identical)
+2. Configure gcloud with your app id.
+
+   ```
+   gcloud config set project <your-app-id>
+   ```
+1. Use the [Admin Console](https://appengine.google.com) to view data, queues, and other App Engine specific administration tasks.
+1. Use gcloud to deploy your app.
+
+   ```
+   gcloud preview app deploy ./
+   ```
+
+1. Congratulations!  Your application is now live at your-app-id.appspot.com
+
+## Contributing changes
+
+* See [CONTRIBUTING.md](../../CONTRIBUTING.md)
+
+## Licensing
+
+* See [LICENSE](../../LICENSE)

datastore/ndb/overview/app.yaml

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+# This file specifies your Python application's runtime configuration
+# including URL routing, versions, static file uploads, etc. See
+# https://developers.google.com/appengine/docs/python/config/appconfig
+# for details.
+
+version: 1
+runtime: python27
+api_version: 1
+threadsafe: yes
+
+# Handlers define how to route requests to your application.
+handlers:
+
+# This handler tells app engine how to route requests to a WSGI application.
+# The script value is in the format <path.to.module>.<wsgi_application>
+# where <wsgi_application> is a WSGI application object.
+- url: .*  # This regex directs all routes to main.app
+  script: main.app
+
+libraries:
+- name: webapp2
+  version: "2.5.2"

datastore/ndb/overview/index.yaml

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+indexes:
+
+# AUTOGENERATED
+
+# This index.yaml is automatically updated whenever the dev_appserver
+# detects that a new type of query is run.  If you want to manage the
+# index.yaml file manually, remove the above marker line (the line
+# saying "# AUTOGENERATED").  If you want to manage some indexes
+# manually, move them above the marker line.  The index.yaml file is
+# automatically uploaded to the admin console when you next deploy
+# your application using appcfg.py.
+
+- kind: Greeting
+  ancestor: yes
+  properties:
+  - name: date
+    direction: desc

datastore/ndb/overview/main.py

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+# Copyright 2015 Google Inc. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# [START all]
+import cgi
+import urllib
+
+import webapp2
+
+from google.appengine.ext import ndb
+
+
+# [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]
+    @classmethod
+    def query_book(cls, ancestor_key):
+        return cls.query(ancestor=ancestor_key).order(-cls.date)
+
+
+class MainPage(webapp2.RequestHandler):
+    def get(self):
+        self.response.out.write('<html><body>')
+        guestbook_name = self.request.get('guestbook_name')
+        ancestor_key = ndb.Key("Book", guestbook_name or "*notitle*")
+        greetings = Greeting.query_book(ancestor_key).fetch(20)
+
+        for greeting in greetings:
+            self.response.out.write('<blockquote>%s</blockquote>' %
+                                    cgi.escape(greeting.content))
+# [END query]
+
+        self.response.out.write("""
+          <form action="/sign?%s" method="post">
+            <div><textarea name="content" rows="3" cols="60"></textarea></div>
+            <div><input type="submit" value="Sign Guestbook"></div>
+          </form>
+          <hr>
+          <form>Guestbook name: <input value="%s" name="guestbook_name">
+          <input type="submit" value="switch"></form>
+        </body>
+      </html>""" % (urllib.urlencode({'guestbook_name': guestbook_name}),
+                    cgi.escape(guestbook_name)))
+
+
+# [START submit]
+class SubmitForm(webapp2.RequestHandler):
+    def post(self):
+        # We set the parent key on each 'Greeting' to ensure each guestbook's
+        # greetings are in the same entity group.
+        guestbook_name = self.request.get('guestbook_name')
+        greeting = Greeting(parent=ndb.Key("Book", guestbook_name or "*notitle*"),
+                            content=self.request.get('content'))
+        greeting.put()
+# [END submit]
+        self.redirect('/?' + urllib.urlencode({'guestbook_name': guestbook_name}))
+
+
+app = webapp2.WSGIApplication([
+    ('/', MainPage),
+    ('/sign', SubmitForm)
+])
+# [END all]

datastore/ndb/transactions/README.md

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+## NDB Transactions Sample
+
+This is a sample app for Google App Engine that exercises the [NDB Transactions Python API](https://cloud-dot-devsite.googleplex.com/appengine/docs/python/ndb/transactions)
+
+This app presents a list of notes. After you submit a note with a particular title, you may not change that note or submit a new note with the same title. There are multiple note pages available.
+
+See our other [Google Cloud Platform github
+repos](https://github.com/GoogleCloudPlatform) for sample applications and
+scaffolding for other python frameworks and use cases.
+
+## Run Locally
+1. Install the [Google Cloud SDK](https://cloud.google.com/sdk/), including the [gcloud tool](https://cloud.google.com/sdk/gcloud/), and [gcloud app component](https://cloud.google.com/sdk/gcloud-app).
+2. Setup the gcloud tool.
+
+   ```
+   gcloud components update app
+   gcloud auth login
+   gcloud config set project <your-app-id>
+   ```
+   You don't need a valid app-id to run locally, but will need a valid id to deploy below.
+
+1. Clone this repo.
+
+   ```
+   git clone https://github.com/GoogleCloudPlatform/datastore-samples.git
+   cd datastore-samples/python/ndb/transactions
+   ```
+1. Run this project locally from the command line.
+
+   ```
+   pip install -r requirements.txt -t lib/
+   gcloud preview app run ./app.yaml
+   ```
+
+1. Visit the application at [http://localhost:8080](http://localhost:8080).
+
+## Deploying
+
+1. Use the [Cloud Developer Console](https://console.developer.google.com)  to create a project/app id. (App id and project id are identical)
+2. Configure gcloud with your app id.
+
+   ```
+   gcloud config set project <your-app-id>
+   ```
+1. Use the [Admin Console](https://appengine.google.com) to view data, queues, and other App Engine specific administration tasks.
+1. Use gcloud to deploy your app.
+
+   ```
+   pip install -r requirements.txt -t lib/
+   gcloud preview app deploy ./app.yaml
+   ```
+
+1. Congratulations!  Your application is now live at your-app-id.appspot.com
+
+## Contributing changes
+
+* See [CONTRIBUTING.md](../../../CONTRIBUTING.md)
+
+## Licensing
+
+* See [LICENSE](../../../LICENSE)

datastore/ndb/transactions/app.yaml

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+# This file specifies your Python application's runtime configuration
+# including URL routing, versions, static file uploads, etc. See
+# https://developers.google.com/appengine/docs/python/config/appconfig
+# for details.
+
+version: 1
+runtime: python27
+api_version: 1
+threadsafe: yes
+
+# Handlers define how to route requests to your application.
+handlers:
+
+# This handler tells app engine how to route requests to a WSGI application.
+# The script value is in the format <path.to.module>.<wsgi_application>
+# where <wsgi_application> is a WSGI application object.
+- url: .*  # This regex directs all routes to main.app
+  script: main.app

datastore/ndb/transactions/appengine_config.py

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+"""
+`appengine_config.py` is automatically loaded when Google App Engine
+starts a new instance of your application. This runs before any
+WSGI applications specified in app.yaml are loaded.
+"""
+
+from google.appengine.ext import vendor
+
+# Third-party libraries are stored in "lib", vendoring will make
+# sure that they are importable by the application.
+vendor.add('lib')