Why to install Python2 Most of the applications are now shifted to Python3 and becoming re-written source code. But somehow, some of the not evolving scripts which were written on Python2 needs to be executed with the help of Python2. To install Python2 sudo apt install python-minimal The above command will download the Python2 last version (2.7.15). …

This process will sometimes trouble you at some point. Because software maintenance & upgrade will cost a lot; unless we are aware of what we are doing. In this post, I wanted to bookmark myself the process of updating all node dependencies in the package.json …

Relational Database Management System is working under main properties. Those properties abbreviated term is called as ACID. Before or after a transactions happen in a database, these 4 properties will be followed to maintain the integrity of a database management system. Atomicity: A transaction must be atomic. Transaction should happen…

I started learning Python a year back and implemented some simple scripts to automate some manual tasks. E.g: Read CSV files and analyzing Download YouTube videos by giving the link Updating Webpages through Rest API So, while implementing all theses I have gone through the keywords like Module, Package and…

In the last article we explored about Abstract Factory Pattern. In this article we are going to learn about a new Decorator Pattern which is belongs to Structural Design Pattern. The Decorator Pattern allows users to add new functionalities to an existing object without making any changes to previously written…

The Abstract Factory is called a factory of factories. In the previous article, we have seen the Simple Factory and Factory Method patterns. This patter too comes under the Creational Pattern category. This provides one of the best ways to create an object. Abstract Factory relies on object composition. Object…

In the last article, we have seen about Singleton Factory which belongs to Creational Patterns (Creational Patterns are mainly focused on creating Objects). Today, we are going to have a look at another type of Creational Pattern called Factory Pattern. The word itself illustrates its functionalities. What is Factory? A place where things…

In our day-to-day coding occurrences, we may have come across some implementations where a class needs to be instantiated only once and no need to instantiate again and again. Some example instances are as follows Objects used for logging Objects that act as device drivers to devices like printers and graphic cards Objects containing registry settings…

Have you ever wondered how big applications or software are working? Imagine while you are playing video games you may have seen some occurrences where changes occur concurrently like meter measurements or the moving objects in the display. These won’t happen at the same time. Each action is executed under…