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The application is running locally on the URL http://127.0.0.1:5000/. 127.0.0.1 is the IP that represents your machine’s localhost and :5000 is the port number. app = Flask (__name__ ) @app .route ( '/' ) @app .route ( '/index/' ) def hello ( ) : return '

Hello, World!

' @app .route ( '/about/' ) def about ( ) : return '

This is a Flask web application.

' users = [ 'Bob' , 'Jane' , 'Adam' ] try : return '

Hi {}

' . format (users [user_id ] ) except IndexError : abort ( 404 ) While in your flask_app directory with your virtual environment activated, you will tell Flask where the factory function is by passing the core application’s directory name app as a value to the FLASK_APP environment variable. Then you will set the FLASK_ENV environment variable to development to run the application in development mode and get access to the debugger. For more information about the Flask debugger, see How To Handle Errors in a Flask Application. When developing a web application, you will frequently run into situations where the application displays an error instead of the behavior you expect. You may misspell a variable or forget to define or import a function. To make fixing these problems easier, Flask provides a debugger when running the application in development mode. In this step, you will learn how to fix errors in your application using the Flask debugger.

Flask Application How To Use an SQLite Database in a Flask Application

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This new route has a variable section . This tells Flask to take the value from the URL and pass it to the view function. The URL variable passes a keyword argument to the capitalize() view function. The argument has the same name as the URL variable ( word in this case). With this you can access the word passed through the URL and respond with a capitalized version of it using the capitalize() method in Python. To add the Flask-SQLAlchemy extension to your application, you’ll first add a Python module called extensions.py, in which you’ll set up your various Flask extensions, to your app directory. This runs certbot with the --nginx plugin, using -d to specify the names we’d like the certificate to be valid for. Also specify the interface and port to bind to using the 0.0.0.0:5000 argument so that the application will be started on a publicly available interface:

Create Your First Web Application Using Flask and How To Create Your First Web Application Using Flask and

Flask is a lightweight Python web framework that provides useful tools and features for creating web applications in the Python Language. SQLite is a simple and fast open source SQL engine that can be used with Python to store and manipulate application data. SQLite works well with Python because the Python standard library provides the sqlite3 module, which you can use to interact with any SQLite database without having to install anything. Using SQLite with Python also requires minimal setup compared to other database engines. Remember that the secret key should be a long random string. For more on web forms and the secret key configuration, see How To Use Web Forms in a Flask Application. You can now interact with the new questions model in your questions blueprint. To do so, open the questions blueprint’s routes.py file for a modification to query and display the questions you have in your questions table: Now that you have the sign-up method completed, you will be able to create a new user. Let’s test the form to create a user.

You then add the post object to the database session, print the object itself and its content, and commit the transaction. When you are finished, hit CTRL-C in your terminal window to stop the Flask development server. Creating the WSGI Entry Point project/auth.py . . . @auth .route ( '/login' ) def login ( ) : return render_template ( 'login.html' ) @auth .route ( '/login' , methods = [ 'POST' ] ) def login_post ( ) : # login code goes here return redirect (url_for ( 'main.profile' ) )