Python Hello World

Python Hello World is a boilerplate example for deploying Python serverless functions on Vercel using the official Python Runtime, provided by Vercel as part of the vercel/examples collection. It gives developers a minimal, runnable API route that can be cloned, deployed with one click, and extended into a larger application.

What is Python Hello World?

Python Hello World is a minimal serverless function template that runs on Vercel and uses the Python Runtime. It exposes an API at the /api route, which returns a basic response when requested. The template is designed to demonstrate how Python functions work on Vercel without needing a separate web framework or server configuration. It lives in the vercel/examples GitHub repository and is maintained by Vercel.

Key Features

• One-Click Deploy — Deploy directly from the GitHub repository using the Deploy with Vercel button, which clones the project and sets it up in your Vercel account.
• Local Development — Run vercel dev after installing the Vercel CLI to serve the API on http://localhost:3000/api.
• Live Demo — A hosted demo is available at https://python-hello-world.vercel.app/ so you can see the expected behavior before deploying your own copy.
• Python Runtime — Uses Vercel's native Python Runtime, so you do not need to configure containers or manage infrastructure.
• Minimal Structure — Contains only the essential files for a single serverless function, making it easy to read, modify, and build upon.
• Official Example — Part of the vercel/examples collection, which Vercel curates to demonstrate patterns for building scalable applications.

Who is it for?

• Developers new to serverless functions — Learn how Python code runs on Vercel by cloning a working example and experimenting with changes.
• Python developers — Use this template as a starting point to prototype APIs or microservices without setting up a full framework like Flask or Django.
• Teams evaluating Vercel — Test the Python Runtime and Vercel's deployment workflow with a minimal, low-risk project.

What can you do with it?

• Prototype an API: Clone the template, modify the function to return custom JSON or text, and deploy it in minutes.
• Test Vercel's deployment flow: Use the one-click Deploy button or import the GitHub repository into Vercel to see continuous deployment in action.
• Build a microservice foundation: Add more routes and functions to transform the hello-world into a multi-endpoint Python API.

How does it work?

The template consists of a single serverless function available at the /api path. When a browser or HTTP client requests that URL, Vercel's Python Runtime executes the function and returns its output. Locally, you install the Vercel CLI (npm i -g vercel), run vercel dev, and the same function is served at localhost:3000/api. Production deployment can be done through the one-click button or by connecting the repository to a Vercel project.

Pros and cons

• Pros: Simple to set up, no configuration required, and deployable in a single click.
• Cons: It only returns a static "Hello World" response, so you must replace the function logic with your own code for real applications; there are no tests or build steps included.

FAQ

How do I run this locally?

Install the Vercel CLI with npm i -g vercel, then run vercel dev in the project directory. Your Python API will be available at http://localhost:3000/api.

How do I deploy this example?

Use the Deploy with Vercel button from the repository readme, which clones the example and deploys it to your Vercel account instantly. Alternatively, push the repository to GitHub and import it in the Vercel dashboard.

Does this use a specific Python web framework?

No. It uses Vercel's Python Runtime directly without depending on Flask, Django, or any other framework. This keeps the example framework-free and lets you structure your function however you like.

What is the purpose of this template?

It demonstrates how to build and deploy a Python serverless function on Vercel, providing a clean starting point for your own APIs and microservices.