Notice: Over the next few months, we're reorganizing the App Engine documentation site to make it easier to find content and better align with the rest of Google Cloud products. The same content will be available, but the navigation will now match the rest of the Cloud products. If you have feedback or questions as you navigate the site, click Send Feedback.

Python 2 is no longer supported by the community. We recommend that you migrate Python 2 apps to Python 3.

Creating a Guestbook Application

Stay organized with collections Save and categorize content based on your preferences.

This tutorial shows you how to build and run a sample Python application for App Engine and provides a code walkthrough of the sample code. The sample is a simple guestbook that lets users post messages to a public message board.

Objectives

  • Build and test an App Engine app using Python.
  • Integrate your application with Google Accounts for user authentication.
  • Use the webapp2 framework.
  • Use Jinja2 templates.
  • Store data in Datastore.
  • Deploy your app to App Engine.

Costs

App Engine has generous free quotas that will cover your testing this tutorial in a live production environment.

Before you begin

  1. Create a new Google Cloud console project or retrieve the project ID of an existing project from the Google Cloud console:

    Go to the Projects page

    Tip: Retrieve a list of your existing project IDs with gcloud.

  2. Install the Google Cloud CLI and then initialize the gcloud CLI:
    Download the SDK

Cloning the project from GitHub

  1. Clone the Guestbook application repository to your local machine:

    git clone https://github.com/GoogleCloudPlatform/appengine-guestbook-python.git
  2. Go to the directory that contains the sample code:

    cd appengine-guestbook-python
    

Building and running locally

To build and run the sample locally:

  1. Start the local development web server by running the following command from the appengine-guestbook-python directory:

    dev_appserver.py ./
    

    The development web server runs and listens for requests on port 8080.

  2. Visit http://localhost:8080/ in your web browser to view the app.

    Click Login, then sign in with any email address. The development server accepts any email you supply, valid or not. This same code requires a valid Google Account and email when deployed to production.

  3. Stop the development server by pressing Control+C.