Consolidate namespace example into this repo

appengine/multitenancy/README.md

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+## Multitenancy Using Namespaces Sample
+
+This is a sample app for Google App Engine that exercises the [namespace manager Python API](https://cloud.google.com/appengine/docs/python/multitenancy/multitenancy).
+
+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/appengine-multitenancy-python.git
+   ```
+1. Run this project locally from the command line.
+
+   ```
+   gcloud preview app run appengine-multitenancy-python/
+   ```
+
+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 appengine-multitenancy-python/
+   ```
+
+1. Congratulations!  Your application is now live at your-app-id.appspot.com
+
+## Contributing changes
+
+* See [CONTRIBUTING.md](CONTRIBUTING.md)
+
+## Licensing
+
+* See [LICENSE](LICENSE)

appengine/multitenancy/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"

appengine/multitenancy/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]
+from google.appengine.api import namespace_manager
+from google.appengine.ext import ndb
+import webapp2
+
+
+class Counter(ndb.Model):
+    """Model for containing a count."""
+    count = ndb.IntegerProperty()
+
+
+def update_counter(name):
+    """Increment the named counter by 1."""
+
+    def _update_counter(inner_name):
+        counter = Counter.get_by_id(inner_name)
+        if counter is None:
+            counter = Counter(id=inner_name)
+            counter.count = 0
+        counter.count += 1
+        counter.put()
+
+    # Update counter in a transaction.
+    ndb.transaction(lambda: _update_counter(name))
+    counter = Counter.get_by_id(name)
+    return counter.count
+
+
+class SomeRequest(webapp2.RequestHandler):
+    """Perform synchronous requests to update counter."""
+
+    def get(self):
+        update_counter('SomeRequest')
+        # try/finally pattern to temporarily set the namespace.
+        # Save the current namespace.
+        namespace = namespace_manager.get_namespace()
+        try:
+            namespace_manager.set_namespace('-global-')
+            x = update_counter('SomeRequest')
+        finally:
+            # Restore the saved namespace.
+            namespace_manager.set_namespace(namespace)
+        self.response.write('<html><body><p>Updated counters')
+        self.response.write(' to %s' % x)
+        self.response.write('</p></body></html>')
+
+
+app = webapp2.WSGIApplication([('/', SomeRequest)], debug=True)
+# [END all]