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We then use the route() decorator to tell Flask what URL should trigger our function.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. This is needed so that Flask knows where to look for templates, static files, and so on. 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). The first argument is the name of the application’s module or package. Next we create an instance of this class. An instance of this class will be our WSGI application. Create a file `hello.py' and write the below code. So, let's build the most simplest hello world application.Īs, you are already present in the myproject folder. You can scale it up for complex applications.Enter fullscreen mode Exit fullscreen modeįlask is now installed: Check out the Quickstart or go to the Documentation. You can easily extend it’s functionality. You may all the decisions: which database to use, do you want an ORM etc, Flask doesn’t decide for you.įlask is one of the most popular web frameworks, meaning it’s up-to-date and modern. Micro means that the Flask framework is simple but extensible. You can and should use many files for larger programs, to handle complexity. It’s a microframework, but that doesn’t mean your whole app should be inside one single Python file. To host and develop online, you can use PythonAnywhere In a web browser open localhost on port 5000 (the url) and you’ll see “Hello World” show up. It then starts a web server which is available only on your computer. Save this program as server.py and run it with python server.py. If you want to develop on your local computer, you can do so easily. To create the “Hello World” app, you only need a few lines of code. On top of that it’s very explicit, which increases readability. It’s easy to get started with Flask, because it doesn’t have a huge learning curve. Unlike the Django framework, Flask is very Pythonic. Why is Flask a good web framework choice? Instead of an abstraction layer for database support, Flask supports extensions to add such capabilities to the application. It is designed to keep the core of the application simple and scalable. This allows you to pass Python variables into HTML templates like this: 1įlask is often referred to as a microframework. Jinja2 is a popular template engine for Python.A web template system combines a template with a specific data source to render a dynamic web page. The Flask framework uses Werkzeg as one of its bases. This enables a web frame to be built on it. Werkzeug is a WSGI toolkit that implements requests, response objects, and utility functions. WSGI is the specification of a common interface between web servers and web applications.
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The Web Server Gateway Interface (Web Server Gateway Interface, WSGI) has been used as a standard for Python web application development. Flask is based on the Werkzeg WSGI toolkit and the Jinja2 template engine.Both are Pocco projects. It was developed by Armin Ronacher, who led a team of international Python enthusiasts called Poocco. What is Flask?įlask is a web application framework written in Python. Related course: Python Flask: Create Web Apps with Flask What is a Web Framework?Ī Web Application Framework or a simply a Web Framework represents a collection of libraries and modules that enable web application developers to write applications without worrying about low-level details such as protocol, thread management, and so on. It does have many cool features like url routing, template engine. It’s has a small and easy-to-extend core: it’s a microframework that doesn’t include an ORM (Object Relational Manager) or such features.
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Flask is a web framework, it’s a Python module that lets you develop web applications easily.