What is Flask?

Flask is a micro web framework written in Python. It is classified as a microframework because it does not require particular tools or libraries. It has no database abstraction layer, form validation, or any other components where pre-existing third-party libraries provide common functions.

Key Features of Flask

  • Simplicity: Flask is simple and easy to use. With a few lines of code, you can have a running web application.
  • Flexibility: Flask doesn’t make decisions for you, such as what database to use, allowing you greater flexibility for your project.
  • Extensibility: While Flask aims to keep the core simple, it can be extended with a wide variety of plugins.
  • Great for APIs: Flask’s simplicity and flexibility make it great for creating APIs.

Why Should You Use Flask?

Flask provides you with tools, libraries, and mechanisms that allow you to build a web application. This web application can be a blog, a wiki, a commercial website or a web API. Flask is easy to get started with as a beginner because there is little boilerplate code for getting a simple app up and running.

Understanding Flask’s Architecture

Flask is based on Werkzeug WSGI toolkit and Jinja2 template engine. Both are Pocco projects. WSGI is the Web Server Gateway Interface. It is a specification for the universal interface between the web server and the web applications.

How to Install Flask?

Flask can be installed by running a simple pip command – pip install flask. For better isolation, you might want to create a virtual environment before installing Flask. This can be done using the following commands:

python3 -m venv env

source env/bin/activate

pip install flask

Sample Flask Application

Here is a simple Flask application:

from flask import Flask

app = Flask(__name__)


def hello():

return "Hello, World!"


Flask is a powerful, flexible and easy to learn web framework for Python. It’s a great choice for website developers due to its simplicity and ease of use, whether you’re creating a small personal project or a commercial website.

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