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Harendra Kumar Kanojiya
Harendra Kumar Kanojiya

Posted on • Updated on • Originally published at

A guide to learn PYTHON 3 in 2021

Python 3 is a truly versatile programming language, loved both by web developers, data scientists and software engineers. And there are several good reasons for that!

• Python is open-source and has a great support community,
• Plus, extensive support libraries.
• Its data structures are user-friendly.

Python Basics: Getting Started

Most Windows and Mac computers come with Python pre-installed. You can check that via a Command Line search. The particular appeal of Python is that you can write a program in any text editor, save it in .py format and then run via a Command Line. But as you learn to write more complex code or venture into data science, you might want to switch to an IDE or IDLE.

What is IDLE (Integrated Development and Learning)

IDLE (Integrated Development and Learning Environment) comes with every Python installation. Its advantage over other text editors is that it highlights important keywords (e.g. string functions), making it easier for you to interpret code.
Shell is the default mode of operation for Python IDLE. In essence, it’s a simple loop that performs that following four steps:
• Reads the Python statement
• Evaluates the results of it
• Prints the result on the screen
• And then loops back to read the next statement.

Python shell is a great place to test various small code snippets.

Main Python Data Types

Every value in Python is called an “object”. And every object has a specific data type. The three most-used data types are as follows:
Integers (int) — an integer number to represent an object such as “number 3”.
Integers => -2, -1, 0, 1, 2, 3, 4, 5

Floating-point numbers (float) — use them to represent floating-point numbers.
Floating-point numbers => -1.25, -1.0, --0.5, 0.0, 0.5, 1.0, 1.25

Strings — codify a sequence of characters using a string. For example, the word “hello”. In Python 3, strings are immutable. If you already defined one, you cannot change it later on.

While you can modify a string with commands such as replace() or join(), they will create a copy of a string and apply modification to it, rather than rewrite the original one.

Strings => ‘yo’, ‘hey’, ‘Hello!’, ‘what’s up!’

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