News website using Flask and news API - Hello World : Part 3

Hello guys,
I think you followed previous steps so you won't get any error.
Day by Day corona cases is increasing and may rise more so just be safe.

I am using VSCode
This is the free and best software to use for python.
Install some extension Flask Snippets, bootstrap.

open newsapp folder in VSCode

Create app.py file

Structure

And code as below

from flask import Flask
app = Flask(__name__)

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

if __name__=="__main__":

   app.run()

1. First we imported the Flask class. An instance of this class will be our WSGI application.
2. Next we create an instance of this class. The first argument is the name of the application’s module or package. If you are using a single module (as in this example), you should use __name__ because depending on if it’s started as application or imported as module the name will be different ('__main__' versus the actual import name). This is needed so that Flask knows where to look for templates, static files, and so on. For more information have a look at the Flask documentation.
3. We then use the route() decorator to tell Flask what URL should trigger our function.
4. The function is given a name which is also used to generate URLs for that particular function, and returns the message we want to display in the user’s browser.

How to run this app?

(env) E:\flask\newsapp>python app.py

or

(env) E:\flask\newsapp>py app.py

Output:

 * Serving Flask app "app" (lazy loading)

 * Environment: production

   WARNING: This is a development server. Do not use it in a production deployment.

   Use a production WSGI server instead.

 * Debug mode: off

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

As we see above this is a production environment and debug is not allowed.

Whenever we deploy any application on server we must have to stop debugging option.

If we change

app.run(debug=True)

and this app

Output :

(env) E:\flask\newsapp>py app.py

 * Serving Flask app "app" (lazy loading)

 * Environment: production

   WARNING: This is a development server. Do not use it in a production deployment.

   Use a production WSGI server instead.

 * Debug mode: on

 * Restarting with stat

 * Debugger is active!

 * Debugger PIN: 100-183-505

 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

That's it for today!!

This is our first simple flask application.

Next Working with API

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