This “Introduction to Python” chapter is the perfect start for you. In this chapter, you will learn what Python is, why it is so popular, its main features, and how people use it. Every topic is written in very simple and easy language, so anyone can understand it quickly and without any stress!
What is a Program?
A computer program is a set of instructions that tells a computer what to do and how to do it. These instructions are written by a programmer using a programming language.
What is Python?
- Python is a general-purpose and high-level programming language used to develop different types of application software.
- It was created by Guido van Rossum in 1991.
- Today, Python is widely used for software development, web development, data analysis, scientific computing, automation, and Artificial Intelligence (AI) applications.
Why is Python So Popular? – Features of Python
Let’s explore the amazing features that make Python one of the most popular programming languages today.
1. Easy to Learn and Use
Python has a simple and readable syntax that looks very similar to English. This makes it one of the best programming languages for beginners.
2. High-Level Language
Python is a high-level programming language, which means its syntax is simple and easy to understand. Programmers can focus on solving problems instead of dealing with complex machine-level details.
3. Free and Open Source
Python is completely free to use. It is also open source, meaning anyone can download, study, modify, and distribute its source code according to the open-source license.
4. Interpreted Language
Python executes code line by line using an interpreter. If an error occurs, execution stops immediately at that line, making debugging easier.
5. Platform Independent
Python programs can run on different operating systems such as Windows, Linux, and macOS with little or no modification.
6. Rich Library of Functions
Python comes with a huge collection of built-in modules and libraries. These help developers perform tasks like mathematical calculations, file handling, web development, networking, and much more without writing everything from scratch.
7. Dynamic Typing
In Python, you do not need to declare the data type of a variable before using it. Python automatically determines the variable’s data type when a value is assigned.
8. General-Purpose Language
Python is an all-round programming language used in many fields, including:
- Web Development
- Data Science
- Artificial Intelligence
- Machine Learning
- Automation
- Software Development
- Scientific Computing
9. Portable
Python programs can easily be transferred from one computer to another and run without major changes.
10. Object-Oriented Support
Python supports Object-Oriented Programming (OOP) using classes and objects. This helps developers write organized, reusable, and maintainable code.
Applications of Python
Web Development
Python is widely used for building websites and web applications. Popular platforms such as Instagram, Spotify, and Netflix use Python in their backend systems.
Business Applications
Python is used to develop business management and accounting software.
Examples include:
- Odoo (ERP Software)
- Triton ERP
- Various accounting applications
Games and 3D Graphics
Python is also used in game development and 3D graphics.
Examples:
- Battlefield 2
- The Sims 4
- Blender (3D modeling and animation software)
Database Access
Python can connect with various database management systems such as:
- MySQL
- PostgreSQL
- Oracle
It is widely used for storing, retrieving, and managing large amounts of data.
Software Development
Python helps developers automate software development tasks.
Examples include:
- Buildbot
- SCons
- Automated Testing Scripts
Desktop GUI Applications
Python can also be used to create desktop applications with graphical user interfaces (GUI).
Examples include:
- BitTorrent
- Deluge
- Desktop Calculator Applications
Common Programming Terms
When you start learning programming, you will frequently come across the following terms. Let’s understand them with simple examples.
Instruction
An instruction is a single command given to the computer to perform a specific task.
Example:
A single step in a cooking recipe such as “Chop the onions.”
Program
A program is a collection of multiple instructions that work together to complete a particular task.
Example:
A complete cake recipe containing all the steps from start to finish.
Software
Software is a collection of multiple programs that work together to perform complex tasks on a computer.
Example:
A cookbook containing many recipes for starters, main courses, and desserts.
Source Code
Source code is the code written by programmers using programming languages such as Python, Java, or C++. It is readable by humans but cannot be understood directly by the computer.
Example:
A letter written in English that needs translation before someone who speaks another language can understand it.
Machine Code
Machine code is the language that the computer’s hardware actually understands. It consists only of binary digits (0s and 1s).
Example:
It is the computer’s native language.
Compiler
A compiler is a translator program that converts the entire source code into machine code at once and generates an executable file (such as a .exe file).
Example:
Like translating an entire English book into Spanish, printing the translated book, and then reading it.
Interpreter
An interpreter is also a translator, but it works differently. It reads the source code one line at a time, translates it, and executes it immediately.
Example:
Like a live translator who listens to a speech and instantly translates each sentence in real time.