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Python Tutorial

Flask getting started: Hello World

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In this tutorial you’ll learn how to build a web app with Python.

We’ll use a micro-framework called Flask. It has a small core but is extensible with many plugins such as SQLAlchemy, Babel, CouchDB, MongoDB etc.

Some Flask example apps are:

Related course

Why Flask?

  • easy to use.
  • built in development server and debugger
  • integrated unit testing support
  • RESTful request dispatching
  • uses Jinja2 templating
  • support for secure cookies (client side sessions)
  • 100% WSGI 1.0 compliant
  • Unicode based
  • extensively documented
Download Flask Examples

Installing Flask

Install Flask using the command below:

pip install Flask

Flask hello world app

Create a file called hello.py 
from flask import Flask
app = Flask(__name__)

@app.route("/")
    def hello():
        return "Hello World!"


if __name__ == "__main__":
    app.run()

Finally run the web app using this command:

$ python hello.py
* Running on http://localhost:5000/
Open http://localhost:5000/ in your webbrowser, and “Hello World!” should appear.

Download Flask Examples

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