Introduction to Python¶

Python is a high-level, interpreted, general-purpose programming language. Its design philosophy emphasizes code readability, using significant indentation rather than curly braces or keywords.

Python was created by Guido van Rossum and first released in 1991.

Why Learn Python?¶

• Easy to Learn: Python syntax is clear and resembles plain English.
• Interpreted Language: Code is executed line by line, making debugging faster.
• Cross-Platform: Runs on Windows, macOS, Linux, and Unix systems without changes.
• Extensive Standard Library: Often described as having "Batteries Included", Python provides built-in modules for mathematics, file manipulation, networking, and data processing.
• Huge Community and Ecosystem: Thousands of open-source packages available via PyPI (Python Package Index).

Simple Python Program¶

print("Hello, World!")

Comparison: Python vs Other Languages¶

In many languages, even printing a simple message requires class definitions and boilerplate code:

print("Hello, World!")

public class Main {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}

#include <iostream>

int main() {
    std::cout << "Hello, World!" << std::endl;
    return 0;
}

Where is Python Used?¶

1. Web Development: Backend frameworks such as Django, Flask, and FastAPI.
2. Data Science and Machine Learning: Libraries such as NumPy, Pandas, Scikit-learn, TensorFlow, and PyTorch.
3. Scripting and Automation: Automating repetitive system administration and data conversion tasks.
4. Desktop Applications: GUI development using Tkinter, PyQt, or wxPython.
5. Cybersecurity and Testing: Writing penetration testing scripts and automated test suites.