In this story I will give overview of the evolution of the enum in Java. You can skip this paragraph. Here I will give you some theoretical definition what enum is. Object oriented view: enum is generalization of Singelton design pattern. Singelton means, that we can have up to 1…

UPDATE: 28.08.2022 Note: This is Python 3.8, for Python 3.9 version go here https://alex-ber.medium.com/docker-container-with-python-3-9-for-arm64-amd64-f2cdf167230f END OF UPDATE This month Anaconda 2021.05 was released. For the first time it contains support for “64-bit AWS Graviton2 (ARM64) platform”. Why do you care? …

Description of high-level API module at AlexBerUtils project — ymlparsers and parser modules serves as Low-Level API for this module. Here is the story about ymlparsers and here is is the story about parser. The source code you can found here. It is available as part of my AlexBerUtils s project. You can install AlexBerUtils from PyPi: python3 -m…

Introduction It is not strickly required to read, theoretical part. The main result of it is provided here. The last example illustrate how to implement mixin in Python. Theoretically, not for any inheritance graph C³ Linearization Algorithm can be linearized. In practice, it is rarely happen, and if it did, Python…

Until now, all our code was in the single file. Also we use only built-in “commands” that are defined in the global scope, but as you can imagine it is not practical to put everything in the global scope, some namespace convention should be imposed. …

Introduction to variables and control flow Let’s look on the following program: {01_variables1.py} If you go to 03_procedural_programming directory and type python 01_variables1.py, you will see on your screen 5. Let’s go line-by-line as interpreter will do and try to understand what happens here. Actually while first line seems very short, there a lot of…

A “Hello, World!” program is a computer program that displays a message similar to “Hello, World!” on the screen/terminal. It illustrate how all surrounding “ecosystem” (such as compilers, interpreters, source files) are used together. It also show some very basic syntax of the programming language. …

Here I will guide you where to find how to install Docker. Docker is most important piece of software you need. The second one, arguably is Git, but don’t worry I’ve included Git inside docker image, this means, that you will get it “for free” as soon as you install…

I remember the exact moment when I’ve decided to write this book — this was in my first year Introduction to Computer Science course at 2000. The topic was polymorphism and I just can’t get it. The language of the course was Java, I did understand how inheritance work in…