Python Flask: A Comprehensive Guide to Building Web Applications DEV Community

However, there are extensions that can be integrated into your Flask application and work well together. For example, Flask-Admin provides an admin interface combined with ORM support, while Flask-Login and Flask-Security add the essential authentication features. Django REST framework is a package for developing web APIs that provides generic class-based views, a browsable API, serializers, and many other useful features. Here, we added a link to our CSS file using the url_for() function, which generates a URL for the static file. The first argument of the function is the name of the view function (here, we use ‘static’), and the second argument is the name of the file in the static/css directory.

  • Its routing system is simple and intuitive, which perfectly fits small projects, especially learning ones.
  • It also supports template inheritance, which allows you to define a base template with common layout and structure, and then extend it in child templates with additional content.
  • In this tutorial, you’ll build a small web application that renders HTML text on the browser.
  • With Django, you’ll have to define the scope of your project before starting.
  • Normally, users don’t interact with a web application by manually editing the URL.
  • Both Django and Flask have built-in testing support compatible with the native Python’s unittest module.

Just like before, you use url_for() to create the full URL for the href attribute. To link to the styles.css file stored in your Flask project’s static/ folder specifically, you use the filename argument. In Flask projects, you commonly save CSS files in a static/ directory. But if you decide to expand the project at some point, you can also use this folder to store images or JavaScript files.

@app.route(‘//edit’, methods=(‘GET’, ‘POST’))

You can also enable debug mode in Flask to get detailed error messages during development. Warning Flask uses a simple web server to serve our application in a development environment, which also means that the Flask debugger is running to make catching errors easier. This development server should not be used in a production deployment. See the Deployment Options page on the Flask documentation for more information, you can also check out this Flask deployment tutorial.

Flask Framework for Python Developers

Its flexibility is one of the key reasons why web developers are learning it in huge numbers, and professionally utilizing it for all kinds of projects. In the above example, we have a template file named « index.html » that can be found in the « templates » folder. The render_template function takes the template name as the first argument and any additional variables as keyword arguments.

By the end of this tutorial, your app.py file will look like this:

You can refer to Flask’s documentation for more information on how to use these features. Flask’s lightweight architecture grants developers remarkable freedom in choosing the tools and libraries they want to integrate. This flexibility means you can flask developer build your application with precisely the components you need, avoiding the inclusion of extraneous functionalities that can burden other frameworks. Flask’s built-in URL routing system simplifies the mapping of URLs to corresponding view functions.

Flask Framework for Python Developers

Included templates are partials that contain a fraction of the full HTML code. To indicate that a template is meant to be included, https://remotemode.net/ you can prefix its name with an underscore (_). By default, Flask expects your templates to be in a templates/ directory.