Python Koans

Koan 20: The Unreliable Messenger

Exploring traps in try/finally blocks, and the reasoning behind PEP601 and PEP765

May 11 • Vivis Dev

3

January 2026

Koan 19: The Unhelpful Eclipse

On the fragility of unintended behavior and the wisdom of explicit paths

Jan 30 • Vivis Dev

3

1

Koan 18: The Loose Bundle

Exploring the pitfalls of raw string literals in Python

Jan 14 • Vivis Dev

3

Koan 17: The Watchman at the Gate

A look into Python's regex module

Jan 7 • Vivis Dev

6

2

1

December 2025

Koan 9: The Unfired Pot REDUX

Experience is simply the name we give our mistakes - Oscar Wilde

Dec 16, 2025 • Vivis Dev

4

November 2025

Koan 16: The Master's Lesson

Why we need "if __name__ == '__main__'"

Nov 5, 2025 • Vivis Dev

1

October 2025

Koan 15: The Invisible Ink

Understanding Unicode equivalence and the deceptive nature of glyphs

Oct 23, 2025 • Vivis Dev

7

2

Koan 14: The Missing Grain

When distributing python package_data goes wrong

Oct 4, 2025 • Vivis Dev

1

September 2025

Koan 13: The Empty Bowl

Understanding Python dataclasses and how fields determine equality and hashing.

Sep 24, 2025 • Vivis Dev

4

Koan 12: The Blacksmith's Hammer

Exploring the dangerous power of unquoted Python strings, and how they caused CVE-2024-9287

Sep 15, 2025 • Vivis Dev

1

1

Koan 11: The Flowing River (Part 2)

Understanding how Python's list comprehensions work under the hood

Sep 9, 2025 • Vivis Dev

4

Koan 10: The Flowing River (Part 1)

Understanding how Python's list comprehensions work under the hood

Sep 2, 2025 • Vivis Dev

3

1