Flask/Hello World

This lesson shows how to display Hello world using Flask.

Readings

Create or modify the Flask application page.
- On Repl.it, modify main.py to include the following code. On your own system, create a new file named app.py with the following code.
  import flask
  
  app = flask.Flask(__name__)
  
  @app.route('/')
  def root():
  return "Hello world!"
  
  if __name__ == "__main__":
  app.run(host='0.0.0.0', port=5000)
Run the program. On your own system use the following command in a terminal window in the same folder as your app.py file:
flask run
Refresh the output window or open a browser window to http://localhost:5000.
Stop the program.