Getting Started with Python

Python is a high-level, interpreted programming language known for its readability and versatility. Let’s get you set up and writing code.

Installing Python

Download Python from python.org (version 3.11+ recommended). During installation on Windows, check “Add Python to PATH”.

Verify the installation:

python --version
# Python 3.12.0

The Python REPL

Python includes an interactive shell called the REPL (Read-Eval-Print Loop). Type python in your terminal to start it:

>>> print("Hello, Python!")
Hello, Python!
>>> 2 + 3
5
>>> exit()

Your First Python Script

Create a file called hello.py:

print("Hello, Python!")

Run it:

python hello.py
# Hello, Python!

Python Syntax at a Glance

Python uses indentation instead of braces to define code blocks:

# No semicolons needed
name = "Alice"

# Indentation matters — 4 spaces is standard
if name == "Alice":
    print("Hello, Alice!")
else:
    print("Hello, stranger!")

# Comments use #

Using the Help System

Python’s built-in help() function is invaluable:

>>> help(print)
# Shows documentation for the print function

>>> help(str)
# Shows all methods available on strings

Writing Clean Python

Python enforces clean code through its syntax:

# ✅ Pythonic — clear and readable
numbers = [1, 2, 3, 4, 5]
squares = [n ** 2 for n in numbers]

# ❌ Not Pythonic (but works)
squares = []
for n in [1, 2, 3, 4, 5]:
    squares.append(n ** 2)

Key Takeaways

• Python uses indentation for code blocks — be consistent with 4 spaces
• The REPL is great for experimenting
• print() and help() are your primary tools
• Python values readability and simplicity

Up next: variables, data types, and the core building blocks of Python.