Python - Introduction

Python is a programming language that you can use to tell the computer what to do.

Think of it like this — if English is a language you use to talk to people, Python is a language you use to talk to computers.

Python is called a high-level language because it is very close to human language. You don't need to worry about the complex stuff — Python handles it for you.

Here are some quick facts about Python:

• It is free to use — anyone can download and install it
• It is cross-platform — it works on Windows, macOS, and Linux
• It is open-source — a big community of developers maintains it
• It is used by Google, Microsoft, NASA and many other big companies

You might be thinking — why should I learn Python when there are many other languages?

Here is the simple answer — Python is the easiest language to start with, and you can build almost anything with it.

Reason 1: Easy to read and write

Python code looks very similar to English. You can read it and understand what it does, even if you are just starting.

Reason 2: Less code means more productivity

In other languages, you might need 10 lines to do something. In Python, you can do it in 2 or 3 lines. This saves you a lot of time.

Reason 3: Huge demand in the job market

Companies like Google, Netflix, Instagram, Dropbox, and Spotify use Python. If you know Python, there are many job opportunities.

Reason 4: Used in exciting fields

You can use Python for:

• Web development (Django, Flask)
• Data Science and Machine Learning (Pandas, TensorFlow)
• Automation and scripting
• Game development
• Artificial Intelligence (AI)

Python was created by Guido van Rossum and first released in 1991. It was named after the British comedy series "Monty Python's Flying Circus."

Key milestones:

• 1991 — Python 0.9.0 released with classes, exception handling, and functions
• 2000 — Python 2.0 added list comprehensions and garbage collection
• 2008 — Python 3.0 released with major improvements and breaking changes
• 2020 — Python 2 reached end of life; Python 3 is now the standard

For the full version timeline, visit Python Versions.

Python is one of the most versatile programming languages. It is used across many industries and domains:

• Web Development — Backend APIs, full-stack apps (Django, Flask)
• Data Science & Analytics — Data cleaning, visualization, reporting
• Machine Learning & AI — TensorFlow, PyTorch, scikit-learn
• Automation & Scripting — Task automation, web scraping
• Game Development — Pygame, game logic scripting
• Desktop Applications — GUI tools with Tkinter, PyQt

For a full breakdown of Python's real-world applications, visit Python Applications.

Let us compare Python with other popular languages so you can understand why Python is a great choice:

When you write a Python program, you save it in a file with the .py extension.

Then you ask Python to run it. Python reads your code, converts it into a language the computer understands (called bytecode), and then executes it.

Here is the simple flow:

You write → Python reads → Computer runs

Let us write a simple Python program and see what happens.

Open your editor (VS Code, PyCharm, or IDLE) and type this:

Let us break it down line by line:

• print() — This is a built-in function in Python. It tells the computer to show something on the screen.
• "Hello, World!" — This is the text inside quotes. It is a string — which is just a piece of text.
• When you run the program, Python prints the text to the output screen.

You will work with two types of Python files:

You can write Python code in any text editor. But using a good editor makes coding much easier. Here are some popular options:

Let us quickly recap what we learned in this lesson:

• Python is a free, open-source programming language
• It was created by Guido van Rossum in 1989
• The name comes from "Monty Python's Flying Circus" — not the snake
• Python is used for web apps, data science, AI, automation, and more
• Python files use the .py extension
• You can write Python code in VS Code, PyCharm, Thonny, or IDLE