Python - Introduction

Overview

Estimated time: 20–30 minutes

Python is a high-level, general-purpose programming language with an emphasis on readability and a rich standard library. This introduction orients you to what Python is good at, how it's used across domains, and what you’ll learn next.

Learning Objectives

• Describe Python’s key strengths and common use cases.
• Understand the Python runtime (CPython) and the role of the standard library.
• Know the immediate next steps: installing Python and running your first program.

Prerequisites

• None. This is the first lesson.

Why Python?

• Readable syntax reduces cognitive load (great for teams and teaching).
• Rich standard library and a massive ecosystem (PyPI) for almost any task.
• Portable across OSes; excellent tooling and community.

Examples

# A simple greeting
name = "World"
print(f"Hello, {name}!")

Expected Output:

Hello, World!

Common Pitfalls

• Assuming Python behavior is identical across versions. We’ll target 3.12+, noting features that require 3.10+.
• Mixing system Python with project Python. Use virtual environments for each project.

Checks for Understanding

1. What does “batteries-included” mean in the context of Python?
2. Why do virtual environments matter?

Exercises

1. Change the variable name and print a different greeting.
2. Print two lines: your name and one thing you want to build with Python.