We can kick-start our application development with a simple example, which gives you an idea of how we program in Python with a flask framework. In order to write this program, we need to perform the following steps:

Here is an example which follows the preceding steps to make a simple application:

from flask import Flask
app = Flask(__name__)

@app.route("/")
def home():
    return "Hello Guest!"

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

In the preceding lines of code, we have created a WSGI application instance using the Flask's Flask class, and then we defined a route which maps the path "/" and the view function home to process the request using a Flask's decorator function Flask.route(). Next, we used the app.run() which tells the server to run the code. And at that end, it will result in a web page showing up "Hello Guest!", when the code is executed.