Dataclasses are an implementation of a code generator, similar to a Named Tuple. The idea of using a code generator is to save time and reduce wordiness.There are two views about the purpose of Dataclasses:<ol><li>It makes a mutable data holder, in the spirit of named tuples</li><li>It writes boiler-plate code for you, simplifying the process of writing the class</li></ol>These 2 world views are reflected in the name: “Dataclasses”Per the dataclasses PEP, they are roughly a “Mutable named tuple with defaults”They provide an elegant syntax for creating data holder objects

Dataclasses & What are they for

In the beginning there where:<ul><li>dicts for look-ups</li><li>tuples for structures</li><li>hand-written classes for more functionality</li></ul>Later Named Tuples where added as a code generator with the goal of adding names to the fields of a tuple. This was limited by design, hence its nameORMs appeared and pioneered using class attributes to specify rich data structuresIn Python 3.6, it became possible to supply <a href="https://deepstash.com/article/137403/an-introduction-to-python-type-hints">type annotations</a>

A History Lesson

<ul><li class="ql-align-justify">Dataclasses are by default mutable</li><li class="ql-align-justify">Named Tuples have methods which start with an underscore which can be confusing. Ex: obj._replace(f=value)</li><li class="ql-align-justify">Named Tuples have legacy code. Ex: _asdict() returns an OrderedDict</li><li class="ql-align-justify">Named Tuples can be unpacked</li><li class="ql-align-justify">Dataclasses are faster at retrieving data but take up more space</li><li class="ql-align-justify">Dataclasses use functions instead of methods. Ex: asdict() vs nt._asdict()</li><li class="ql-align-justify">Dataclasses are underlying stored as instance dicts</li></ul>

Comparison with Named Tuples

If you have an immutable mind get out!

<ul><li>Dunder methods like init, repr, eq, lt, le, etc.</li><li>Frozen nature by generating dunder methods for __setattr__ and __delattr__</li><li>Class variables for the provided attributes</li></ul>The code generation can be configured by providing keyword arguments to the @dataclass decoratorA complete list of methods and configurations can be found <a href="https://docs.python.org/3/library/dataclasses.html">here</a>

Generated Code Includes

In the image example, the generated code includes:<ul><li>typed attributes</li><li>hidden attributes from __repr__ response</li><li>custom __hash__ dunder with the selected fields</li><li>attribute with default factory value in __init__ constructor</li></ul>

A Complex Example of using Dataclasses

I started using Dataclasses and I think you should too

Speaker: Raymond Hettinger The PEP 557 dataclasses module is available in starting in Python 3.7. It will become an essential part of every Python programmer's toolkit. This talk shows what problem the module solves, explains its key design decisions, and provides practical examples of how to put it to work. Dataclasses are shown to be the next step in a progression of data aggregation tools: tuple, dict, simple class, bunch recipe, named tuples, records, attrs, and then dataclasses. Each builds upon the one that came before, adding expressiveness at the expense of complexity. Dataclasses are unique in that they let you selectively turn-on or turn-off its various capabilities and it lets the user choose the underlying data store (either instance dictionary, instance slots, or an inherited base class). Dataclasses and typing.NamedTuple both use variable annotations which were new in Python 3.6. Slides can be found at: https://speakerdeck.com/pycon2018 and https://github.com/PyCon/2018-slides

Backend

Dataclasses:  The code generator to end all code generators

For years, technical careers have been gaining more attention among innovative individuals. In a digital world, people capable of speaking computer language often have the widest selection of job opportunities. However, before you can start you need to build your skills. That’s where free coding websites come in. A free online coding website is an environment where you can develop your understanding of various kinds of code, update your programming skills, and even earn certifications. Today, we’re going to be looking at some of the most impressive coding websites on the market.

Coding knowledge

<a href="https://www.bitdegree.org/">BitDegree</a> is a wonderful website for anyone interested in web development, coding, data science, and programming. There are various courses to choose from, depending on the career path you want to take. For instance, you can learn about the AWS cloud or start your journey into gaming development. For coding, BitDegree covers languages like:CSS, HTML, PHP, SQL,JavaScript, jQuery etcThe best thing about BitDegree is how it makes learning so fun. There are gamified courses and sections where you can really dive into the essentials of coding.

BITDEGREE

One of the most popular sites for learning how to code for free, <a href="https://www.codecademy.com/">CodeAcademy</a> is home to over 24 million students who have built their skills. The interactive learning approach lets you apply what you’ve learned immediately. Over 300 million hours of free coding content,You can learn languages such as:CSS, JavaScript, HTML, PHP, jQuery, Python, Ruby etcCodeAcademy is particularly effective for beginners because you get instant feedback after submitting your coding efforts. When you make mistakes, you’ll find out exactly where you went wrong, allowing you to avoid similar mistakes in the future.

CODEACADEMY

<a href="https://www.codewars.com/">Codewars</a> by Qualified is definitely one of the most versatile free platforms for learning how to code. There are dozens of languages you can learn – too many to list right here. Options range from C++ and C# to Ruby, Python, Lean, Java, PHP, Scala, and countless others.Codewars teaches you your programming language in-depth by selecting challenges designed to put your mind to the test. The goal for each challenge is to help you sharpen your knowledge over time, with tasks that get progressively difficult.The cool thing about Codewars is it allows you to see how you respond to challenges .

CODEWARS

Designed for a younger community of would-be coders, <a href="https://code.org/">Code.org</a> is an engaging and highly accessible introduction to coding. With around 60 million students worldwide, the Code.org platform gives you access to a wide range of different learning opportunities intended to suit different needs and learning levels.The Code.org environment is built on a desire to bring coding into the standard curriculum. You can dive into full one-hour tutorials, or you can experiment. There’s also a huge catalog of courses extending from basic coding for younger kids to University-level education.

CODE.ORG

A diverse option in our free coding website list <a href="https://www.freecodecamp.org/"> Free Code Camp</a> is all about developing your coding knowledge while networking with other like-minded people in the industry. The solution allows you to learn coding by participating in challenges .To help you jump in, you’ll have access to a range of courses and tutorials. You can even code for non-profits on the platform in languages like: HTML5, Javascript, Node.JS, React.JS, Databases, GitIf you’re a little nervous about the concept of coding alone, you’ll have a full community to work within the Free Code Camp.

FREE CODE CAMP

<a href="https://www.codeconquest.com/">Code Conquest</a> is less of a course website and more of a comprehensive guide for beginners diving into the world of code. This amazing platform will help you understand all of the basics of coding in no time – even if you’re brand-new to the landscape. The website is full of resources for all kinds of coders, including comprehensive tutorials, reviews, a knowledge center, training packs, and more. You can even choose from a range of languages like: CSS, HTML, PHP , jQuery , Ruby, JavaScript, Python and MySQLTo help you figure out where you should get started.

CODE CONQUEST

One of the better-known free websites for coding on the market today, <a href="https://www.w3schools.com/">W3Schools</a> is an environment packed full of example codes, resources, tutorials, exercises, and libraries to help you learn how to code. The site is one of the largest in the world for developers.To begin coding with W3 Schools, you’ll need to choose the programming language that’s right for you, then either jump into the program immediately or select from a range of learning options. The site comes with a handy quiz to help you define your knowledge level.Languages range from CSS to SQL, JavaScript, HTML, Python, Java, C++

W3SCHOOLS

<a href="https://www.codeavengers.com/">Code Avengers</a> offers a fun and interactive approach to learning how to program and code. There are various course options to teach you how to create everything from games and apps to entire websites. The good thing about the Code Avengers website is you don’t need a lot of spare time to start learning. You can choose from languages like HTML, CSS, Python, jQuery, JavaScript, and more, and connect with a wide selection of similar coding enthusiasts, just like you. The biggest downside is that the free trial only lasts for seven days before you’ll need to pay to use the full program.

CODE AVENGERS

A simple and effective website for learning how to code and building your existing skills. There are tons of videos and demos to walk you through the process of learning how to code from scratch. All you need to do is click on one of the things you want to learn how to do, like creating a simple web page, and the site will give you a video walkthrough.Though a little simple compared to other coding resources, the <a href="https://thecodeplayer.com/">Code Player</a> still has a lot of great video guidance to help beginners jump into various languages. For example, you can learn about CSS and HTML or check out various tools to help.

THE CODE PLAYER

If you’re particularly interested in learning about Java, the <a href="https://codegym.cc/">CodeGym</a> is probably the website for you. This online Java programming course teaches you the basics of Java by allowing you to dive into various tasks. You can get involved with various exercises depending on your existing skill level and play around with games designed to teach you more about the coding landscape.This website is fantastic for people in all stages of the coding journey. Whenever you suggest a solution to a challenge, the website will give you immediate feedback to learn from.

CODEGYM

One of the better-known free coding websites on the market, the <a href="https://www.theodinproject.com/">Odin Project</a> aims to take the headaches and frustration out of learning web development. If you’re a beginner looking to develop a career in coding, then the Odin Project will give you all the pieces of the puzzle required to decide exactly where you want to go and build the appropriate skills.This site offers a full-stack curriculum of coding education options, with tons of challenges, tasks, and exercises to help you put your newly gained knowledge to the test. You’ll learn how to program in languages like CSS and HTML, etc

THE ODIN PROJECT

Previously known as Code School, <a href="https://www.pluralsight.com/?utm_term=&pslp=home&aid=701j0000002BGhXAAW&promo=&utm_source=branded&utm_medium=digital_paid_search_google&utm_campaign=INDIA_Brand_E&utm_content=&cq_cmp=223387038&gclid=Cj0KCQjwkbuKBhDRARIsAALysV6d8lekEsoHg0cT1MJO1kU8gWJHVxLYhHk2ayrwG4lpx3QqsWDwWasaAh27EALw_wcB">Plural Sight </a>is a fantastic online learning platform that allows you to build your knowledge through a range of paid and free courses. The comprehensive platform is organized into a wide selection of different learning paths. You can choose how you want to develop your skills based on your chosen language and your existing skillset.You choose an education path created by professional instructors to achieve specific outcomes, and Plural Sight gives you all the material you need.

PLURAL SIGHT

Career

FREE WEBSITES FOR LEARNING TO CODE IN 2021

In this part we will be going over more on variables and printing them.So let's make a variable and give it the value of 10, so it should look something like this X = 10, X could be any word really just not a reserved word, here is a link to a website with alot of reserved words that can't be used https://realpython.com/lessons/reserved-keywords/. and scroll down a little and you will see key words.Once you have the variable made let's print the variable.So like before very simply print(x), as you can see in the image above. Now lets run and se the output which in this case be 10.

Learning Python: More on printing and variables

Learning Python

Python: Part Four

When you start to learn coding for the first time you will probably be stuck following tutorials.Following tutorials is great for learning syntax and structures or new frameworks, but for learning to produce your own code it's not so great.I think the best way is to learn coding is just starting a project that you are intrested in and that is more advanced that your current level.When you inevitably get stuck just google your problems and ask people for help. After finishing that kind of challenging project you will have learnt so much more than ever just following tutorials.

Learn To Code

Xifias on Aug 10

The first thing we need to consider when starting to learn a programming language, is what shall we use. There are a few things we can use, for example python IDLE, pycharm, VS code, notepad++, anaconda or Google Colab.For these lessons I would recommend pycharm. But first we need to install python.https://www.python.org/downloads/This is where we can download python, just make sure the correct version is installed, so for example x64 or x32 depending on your machineThis is so your computer can run the python code.Next part will be about the programs we can use in more depth

Dataclasses: The code generator to end all code generators

FREE WEBSITES FOR LEARNING TO CODE IN 2021

Python: Part Four

Xifias on Aug 10

Python Part One

It's time to

READ

LIKE

A PRO!