Quickstart for Python 3 in the App Engine Standard Environment

This quickstart shows how to deploy a sample app on App Engine. If you want to learn about coding an app for App Engine, see Building an app.

Costs

There are no costs associated with running this guide. Running this sample app alone does not exceed your free quota.

Before you begin

Before running and deploying this quickstart, install the Cloud SDK and then set up a GCP project for App Engine:

  1. Download and install Cloud SDK:

    Download the SDK

    Note: If you already have the Cloud SDK installed, update it by running the following command:

    gcloud components update
    
  2. Create a new project:

    gcloud projects create [YOUR_PROJECT_ID] --set-as-default
    

    Verify the project was created:

    gcloud projects describe [YOUR_PROJECT_ID]
    

    You see project details that might look like the following:

    createTime: year-month-hour
    lifecycleState: ACTIVE
    name: project-name
    parent:
    id: '433637338589'
    type: organization
    projectId: project-name-id
    projectNumber: 499227785679
    
  3. Initialize your App Engine app with your project and choose its region:

    gcloud app create --project=[YOUR_PROJECT_ID]
    

    When prompted, select the region where you want your App Engine application located.

  4. Make sure billing is enabled for your project. A billing account needs to be linked to your project in order for the application to be deployed to App Engine.

    Enable billing

  5. Install the following prerequisites:

    • Run the following command to install the gcloud component that includes the App Engine extension for Python 3.7:

      gcloud components install app-engine-python
      

  6. Prepare your environment for Python development. It is recommended that you have the latest version of Python, pip, and other related tools installed on your system. For instructions, refer to the Python Development Environment Setup Guide.

App Engine locations

App Engine is regional, which means the infrastructure that runs your apps is located in a specific region and is managed by Google to be redundantly available across all the zones within that region.

Meeting your latency, availability, or durability requirements are primary factors for selecting the region where your apps are run. You can generally select the region nearest to your app's users but you should consider the location of the other GCP products and services that are used by your app. Using services across multiple locations can affect your app's latency as well as pricing.

App Engine is available in the following regions:

  • northamerica-northeast1 (Montréal)
  • us-central (Iowa)
  • us-west2 (Los Angeles)
  • us-east1 (South Carolina)
  • us-east4 (Northern Virginia)
  • southamerica-east1 (São Paulo)
  • europe-west (Belgium)
  • europe-west2 (London)
  • europe-west3 (Frankfurt)
  • europe-west6 (Zürich)
  • asia-northeast1 (Tokyo)
  • asia-northeast2 (Osaka)
  • asia-east2 (Hong Kong)
  • asia-south1 (Mumbai)
  • australia-southeast1 (Sydney)

You cannot change an app's region after you set it.

If you already created an App Engine application, you can view the region by running the gcloud app describe command or opening the App Engine Dashboard in the GCP Console. The region of your App Engine application is listed under http://[YOUR_PROJECT_ID].appspot.com.

This quickstart demonstrates a simple Python app written with the Flask web framework that can be deployed to App Engine. Although this sample uses Flask, you can use any web framework that satisfies the requirements above. Alternative frameworks include Django, Pyramid, Bottle, and web.py.

Download the Hello World app

We've created a simple Hello World app for Python 3.7 so you can quickly get a feel for deploying an app to the Google Cloud Platform.

  1. Clone the Hello World sample app repository to your local machine.

    git clone https://github.com/GoogleCloudPlatform/python-docs-samples
    

    Alternatively, you can download the sample as a zip file and extract it.

  2. Change to the directory that contains the sample code.

    cd python-docs-samples/appengine/standard_python37/hello_world
    

Run Hello World on your local machine

To run the Hello World app on your local computer:

Mac OS / Linux

  1. Create an isolated Python environment in a directory external to your project and activate it:
    python3 -m venv env
    source env/bin/activate
  2. Navigate to your project directory and install dependencies:
    cd YOUR_PROJECT
    pip install  -r requirements.txt
  3. Run the application:
    python main.py
  4. In your web browser, enter the following address:
    http://localhost:8080

Windows

Use PowerShell to run your Python packages.

  1. Locate your installation of PowerShell.
  2. Right-click on the shortcut to PowerShell and start it as an administrator.
  3. Create an isolated Python environment in a directory external to your project and activate it:
    python -m venv env
    env\Scripts\activate
  4. Navigate to your project directory and install dependencies:
    cd YOUR_PROJECT
    pip install -r requirements.txt
  5. Run the application:
    python main.py
  6. In your web browser, enter the following address:
    http://localhost:8080

The Hello World message from the sample app displays on the page. In your terminal window, press Ctrl+C to exit the web server.

Deploy and run Hello World on App Engine

To deploy your app to the App Engine standard environment:

  1. Deploy the Hello World app by running the following command from the standard_python37/hello_world directory:

    gcloud app deploy

    Learn about the optional flags.

    Common gcloud command flags

    • Include the --version flag to specify an ID that uniquely identifies that version of your app, otherwise one is generated for you. Example: --version [YOUR_VERSION_ID]
    • Include the --project flag to specify an alternate GCP project ID to what you initialized as the default in the gcloud tool. Example: --project [YOUR_PROJECT_ID]

    Example:

    gcloud app deploy --version pre-prod-5 --project my-sample-app

    To learn more about deploying your app from the command line, see Testing and Deploying Your App . For a list of all the command flags, see the gcloud app deploy reference.

  2. Launch your browser to view the app at http://YOUR_PROJECT_ID.appspot.com

    gcloud app browse
    where YOUR_PROJECT_ID represents your GCP project ID.

This time, the page that displays the Hello World message is delivered by a web server running on an App Engine instance.

Congratulations! You've deployed your first Python 3.7 app to App Engine standard environment!

See the following sections for information about cleaning up as well as links to possible next steps that you can take.

Clean up

To avoid incurring charges, you can delete your GCP project to stop billing for all the resources used within that project.

  1. In the GCP Console, go to the Manage resources page.

    Go to the Manage resources page

  2. In the project list, select the project you want to delete and click Delete .
  3. In the dialog, type the project ID, and then click Shut down to delete the project.

What's next

Learn the whole platform

Now that you know what it's like to develop and deploy App Engine apps, you can explore the rest of GCP. You already have the Cloud SDK installed which gives you the tools to interact with products like Cloud SQL, Cloud Storage, Cloud Firestore, and more.

Learn about the App Engine standard environment

Here are some topics to help continue your learning about App Engine:

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App Engine standard environment for Python 3