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app . logger . debug ( 'A value for debugging' ) app . logger . warning ( 'A warning occurred ( %d apples)' , 42 ) app . logger . error ( 'An error occurred' ) In this new version of the index() function, you first open a database connection using the get_db_connection() function you defined earlier. Then you execute an SQL query to select all entries from the posts table. You implement the fetchall() method to fetch all the rows of the query result, this will return a list of the posts you inserted into the database in the previous step. Django was created in 2003 by Web Developers Adrian Holovaty and Simon Willison. They began creating web applications using Python, and Django was born. Two years later, it was publicly released. Template inheritance also gives you the ability to reuse the HTML code you have in other templates ( base.html in this case) without having to repeat it each time it is needed. Each framework has a different way to put together its routes, models, views, database interaction, and overall application configuration. I'll describe those aspects of each framework in this series, which will begin with Flask. Flask startup and configuration

Chinese Dragon print Water Bottle | Insulated | Stainless Steel | Vivid print | Gift Idea | Gym, Work, Travel Custom Hip Flask, Personalized Flask with Custom Image, Custom Flask Gift for Him, Groomsman Flask, Your Logo Here Flask, Gift for Dad This is where you write the bulk of your web application code based on inputs and client requests. The controller is the central part of the Flask framework because it manages and changes the view and model based on client input to update what information is presented. The Flask view Whenever data is sent to the application, regardless of the HTTP method used, that data is stored on the form attribute of the request object. The name of the field on the frontend will be the name of the key mapped to that data in the form dictionary. It'll always come in the form of a string, so if you want your data to be a specific data type, you'll have to make it explicit by casting it as the appropriate type.And that's it! That's a basic view for creating a new Task object in Flask given the current setup of your To-Do List application. Similar views could be constructed for listing, editing, and deleting tasks, but this example offers an idea of how it could be done. The bigger picture You first import the sqlite3 module and then open a connection to a database file named database.db, which will be created once you run the Python file. Then you use the open() function to open the schema.sql file. Next you execute its contents using the executescript() method that executes multiple SQL statements at once, which will create the posts table. You create a Cursor object that allows you to use its execute() method to execute two INSERT SQL statements to add two blog posts to your posts table. Finally, you commit the changes and close the connection. It’s a microframework, but that doesn’t mean your whole app should be inside one single Python file. You can and should use many files for larger programs, to handle complexity. Django web apps manage data and communicate with databases through Python objects called models. For example, the data structure used in the web app is defined by the model, which can define characteristics like size, default values, and label texts for online forms.

Once the file finishes execution, a new file called database.db will appear in your flask_blog directory. This means you’ve successfully set up your database. Lunch bag Hydration Flask Bundle |Lunch bag for women |lunch tote |bridesmaid gift |personalized |personalised giftYou can make things simpler by using environment variables. They will ensure that, no matter what machine the code runs on, it always points at the right stuff if that stuff is configured in the running environment. It also ensures that, even though you need that information to run the application, it never shows up as a hardcoded value in source control.

A good way to get moving is to turn the codebase into an installable Python distribution. At the project's root, create setup.py and a directory called todo to hold the source code. URL routes are case-sensitive. For example, the route /hello/ is distinct from /Hello/. If you want the same function to handle both, use decorators for each variant. WSGI is an acronym for web server gateway interface which is a standard for Python web application development. It is considered the specification for the universal interface between the web server and web application. What is Jinja2? head > Start with a view that handles only GET requests, and respond with the JSON representing all the routes that will be accessible and the methods that can be used to access them. from flask import jsonifyfrom werkzeug.utils import secure_filename @app . route ( '/upload' , methods = [ 'GET' , 'POST' ]) def upload_file (): if request . method == 'POST' : file = request . files [ 'the_file' ] file . save ( f "/var/www/uploads/ { secure_filename ( file . filename ) } " ) ... Flask is great for small to medium projects that do not require the complexity of a large framework.