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Build Your First Flask App

Each time we visit a URL in a browser, it makes a request to the web server, which processes the request and returns a response back to the browser. In our Flask app, we can create endpoints to handle the various requests. Requests from different URLs can be directed to different endpoints in a process called routing.

To build a route, we need to first define a function, known as a view function, that contains the code for processing the request and generating a response. The response could be something as simple as a string of text. Then, we can use the route() decorator to bind a URL to the view function such that the function will be triggered when the URL is visited:

@app.route('/') def home(): return 'Hello, World!'

The route() decorator takes the URL path as parameter, or the part of the URL that follows the domain name. All URL paths must start with a leading slash. In the above example, if we visit http://localhost:5000/ in the browser, Hello, World! will be displayed on the webpage.

Multiple URLs can also be bound to the same view function:

@app.route('/') @app.route('/home') def home(): return 'Hello, World!'

Now, both http://localhost:5000/ and http://localhost:5000/home will display Hello, World!.



Define a function called home() that returns 'Hello, World!'


Use the route() decorator to bind the URL path '/' to the view function.

Run and view your page at http://localhost:5000/ in the browser. What do you see?


Bind a second URL path '/home' to the home() function.

Navigate to http://localhost:5000/home in the browser.


Let’s create another route! Define a function called reporter() that returns 'Reporter Bio' and is bound to the path '/reporter.

Navigate to http://localhost:5000/reporter in the browser.

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