What is python flask (detailed Introduction)

python flaslk programming language


Python flask is a web-based and lightweight application framework which is used for making web applications. Flask is based on the Werkzeg WSGI toolkit and the Jinja2 template engine. With the help of flask, we can make small web applications as well as long web-based applications. In our daily life, we can see a lot of websites available on web browsers like techcrunch.com and enlightmenow.com [ with the help of which we can read blogs to increase our knowledge]. Similarly, imdb.com is also a web application [which is used for entertainment] and many other web applications. We can make these web-based applications also on the flask.

Flask is the basic framework but not so basic that you create a Facebook or WhatsApp on the first day. As we know that developing any web-based application we used some algorithms and involve some levels that we must follow for making a web application.

In every web application, there must be a server, Databases, front-end as well as backend, and many other things that every web-based application included. In the list or sequence of this environment, we must check where the flask will adjust. And how can Flask help us with that?

You can use Flask if you are a python developer doesn’t matter if you are a beginner or not. In python Flask is not only the one that is used for web-based developing, there is also Django (which is also used for web-based applications, and supports dynamic HTML pages, further we will discuss later).

Werkzeg WSGI toolkit:

Pypi.org defines werkzeug as, it’s a German word, {werk} means “work” and {zeug} means “tool”. It is the comprehensive WSGI (Web Server Gateway Interface) and gives many facilities like,

  • HTTP utilities for controlling dates, caches, and cookies.
  • It can handle streaming data and wrap other applications
  • And many others for further details you can visit the Pypi.org website.

Jinja2 template:

It is a template engine that allows us to combine the templates of the data sources to extract dynamic web-based pages.

There are numerous reasons why we use Python Flask, some of the main reasons are.

  • Flask is Unicode based.
  • Flask is very easy to use.
  • Flask is a micro and lightweight framework.
  • Flask provides very well support for API.
  • We can use Flask for basic development.
  • Flask is suitable for rapid app development.
  • Flask gives a lot of flexibility, and we can do a lot of modifications.
  • As compared with Django, we can do modifications in both i-e in Flask and Django but with Flask we can do modifications easier than others.
  • Flask gives us various scenarios to explore for documentation.
  • Flask is a built-in server as well as a debugger.
  • Flask gives an Establishment for integrated testing support.
  • Flask is the web-application that gives flexibility, simplicity, and scalability.

Basic Syntax with an Example

This requires Python 3.10.7 or the latest with all the Flask extensions installed as a pre-requisite.

You can download the latest version of python from python.org. and also download other libraries from the search box of that site.

The following code shows the structure of a web application that displays the message “Hello World!” when it is visited:

#this is the simple syntax of python flask

from flask import Flask

app = Flask(__name__)


def helloWorld():

return ‘Hello guys, this is your Hello World program…’

if __name__ == ‘__main__’:


What Python Flask is used for?

In Python, Flask is a framework for building microwebs. The Flask microweb framework is written entirely in Python and is used for building microwebs. There are several microweb frameworks, but Flask is one of the most popular.

Flask is a framework for building back-end web applications, meaning that it provides the technologies, tools, and modules you need to configure your web application’s functionality, rather than focusing exclusively on how it looks or how it works. With Flask you can implement the business logic of the web application.

As discussed above, python is a micro framework which means that the Flask framework is simple but also extensible. Here I will offer you some of the main features,

  • It’s up to you to decide which database to use, whether you want an ORM, etc. Flask does not decide for you.
  • There is no need to use any library or tool in order to use this.
  • There is no extra component included in it.
  • It has no Data Base abstraction layer from validation or any other component.
  • Third-party libraries can be added easily.
  • It’s easy and quick to get started when you know what you’re doing

As further Explanation, Flask offers many vital suggestions but does not enforce any dependencies or project layout, it is up to the developer to choose the tools they want to use. There are many extensions provided by the community that makes adding new functionality easy.

Flask is a wonderful framework for creating web applications that are both easy to use and fun to use. It is crucial that you understand Python, as well as the front-end basics before you can learn Flask. You do not have to know a lot about front-end development to learn Flask. If you are aware of HTML, you will be able to learn how Flask works. However, if you have knowledge of CSS and Java script, that would be helpful for making the app appear better.

Examples of Flask projects

Various needs can be met with Flask as it can be used to create both simple and large-scale web applications for multiple purposes. These are a few examples of Flask projects you might find useful.

  • Feedback Form
  • Blog APP
  • Weather APP
  • Rest API, etc

Who made Python flask?

An international group of Python enthusiasts formed in 2004 called Pocoo was responsible for creating Flask, which was created by Armin Ronacher. Ronacher claims that the idea was originally meant to be a joke for April Fool’s Day, but that it proved to be so popular that it became a serious application. Flask is released under a BSD (Berkeley Source Distribution) license. A Jinja2 template and the Werkzeug toolkit are both used to implement this Framework and these both are Pocoo projects.

Which one is better flask or Django?

In the web development world, Python is a popular and demand-driven technology. It has a rich ecosystem of tools, libraries, and frameworks. Web developers are already making their lives easier with Python and its framework if you’re already using it for web development. Python and its framework allow web developers to build any type of web application immediately little, enormous, complex, or frivolous.

What is Django?

The application structure of Django can play a critical role in the success of your project as it has a rigid structure.

what is django

An open-source web application framework based on Python; Django is a high-level, high-performance web development framework. The Django framework offers a set of components that improve the speed of development and make the entire development process easier for developers.

Among the popular web applications and sites that utilize the Django framework are PBS, Mozilla, Instagram, and The Washington Post, among others.

What is Flask?

python flask

An application that has a narrow range of functionalities can use Flask to achieve its goals.

As we discussed above, unlike other frameworks, Flask does not require users to install any libraries or tools and is written in Python. Flask does not allow developers to integrate third-party libraries. It supports extensions that can be added to add functions to the system.

The Flask framework has been used by a few organizations, including some of these organizations include Netflix, Reddit, Zillow, LinkedIn, and Mail-Gun.

Templates of Flask vs Django

In contrast to Django, Flask does not come with a built-in template engine. As a substitute, it is based on the Jinja2 format engine, and this means that it is also possible to use Jinja2 with Django.

  • In terms of syntax, Jinja2 and Django’s templating engines are rather similar.
  • With Django, you have access to Django Template Engine.
  • It comes with Jinja2 which offers a lot of useful features that can be used by Python developers in the project with Flask.

Django Vs Flask : Which one to choose?

An extremely lightweight framework with minimal features.We have developed a full-stack web framework that follows the batteries-included approach.
There is an opportunity for developers to explore the core of the application and retain control of it at the same time.As a result, developers already have access to the most common features that make development faster and easier.
Flask’s template engine, Jinja2, is based on Django’s template engine, which is what makes Flask unique.A lot of time is saved by the built-in framework engine which permits the development to be done faster.
As with Django, there are not as many admin features as there are in Mongo.The Django-admin tool is a built-in bootstrapping tool with which developers can build web applications without any external input, which is pretty handy.
A Python developer writing a Flask application must work with different databases by installing an ORM system for Python and selecting SQLAlchemy as the SQL toolkit. SQL queries must be written for common tasks in order to use Flask.With the built-in ORM system, developers can use any database and perform common tasks within the database without having to write long queries and write complicated queries.
You can start with Flask as you are looking for a good introduction to web development. There are many websites built on the flask that receive high traffic, but not as much as those built on Django.There is no way Django is suitable for projects whose requirements are dynamic and are likely to change over time.
There is no restriction on plugins or libraries that developers can use so that they can make functionalities in a flexible manner.Django offers an increasing amount of flexibility, but it is not as flexible as the modules provided by the framework.
The Flask application requires fewer lines of code to be written for a simple task than any other application.Flask requires more than two times the amount of lines of code as Django does for the same functionality

Is Flask back-end or Front-end?

Both Flask and Django are considered “Back Ends.” This means that Flask and Django should perform every single feature on a server, and those who run in the browser should perform the same thing on a client.

In addition to being an easy-to-use Python web framework, Flask can also be used to create a web front-end for your Python automation tools. While this post is not intended as a how-to guide for Flask, I wanted to go over some basic components to demonstrate what can be done with it. Flask is mainly Python and a little bit of HTML at the end of the day.

How long it Takes to learn Flask?

Although Flask is an easy-to-use framework and can be learned within a week, it may take the trainees some time to master it, depending on how familiar they are with Python.. Though the course can be completed within a week, it may take the trainees some time to master this framework.

Here are some websites which give certification to learn flask.

  1. Flask Course
  2. The Flask framework is very well documented, and you can take guidance from questions on stack overflow if you need it.
  3. W3schools.com


In order to be good at Web application development, I would suggest that you go with Flask because of its being Lightweight and other amazing features. Read the article completely and you will have a good understanding of choosing Flask. Good Luck…

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