Pythonic Patterns

12 pages in this section.

Why Python's patterns look different from other languages' design patterns - the dynamic object model and dunder-method protocol underneath EAFP, context managers, strategy, and dependency injection - the mental model behind every other page in this section.

Explainer Python Pythonic Patterns Duck Typing

Pythonic Patterns Basics

Learn 10 Pythonic Patterns, including EAFP key lookups, context managers for files, and strategy dictionaries to replace if/elif chains.

Python Pythonic Patterns Basics Examples

EAFP vs LBYL

Understand EAFP and LBYL patterns in Python. Learn when to use "Easier to Ask Forgiveness" with exceptions versus "Look Before You Leap" with checks.

Python Pythonic Patterns Eafp Lbyl

Context Managers as a Pattern

Learn how Python context managers guarantee resource setup and teardown, manage temporary state, and handle transactions reliably.

Python Pythonic Patterns Context Managers Resources

The Strategy & Dispatch Patterns

Replace if/elif chains with strategy registries or singledispatch for extensible dispatch patterns in Python. Learn when to apply each.

Python Pythonic Patterns Strategy Dispatch

Factory & Builder Patterns

Learn to use Factory and Builder patterns in Python to construct complex objects, manage dependencies, and simplify object creation logic.

Python Pythonic Patterns Factory Builder

Observer & Pub/Sub

Learn how Observer and Pub/Sub patterns decouple components in Python. Implement event handling with callables, lists, or libraries like Blinker.

Python Pythonic Patterns Observer Pubsub

Dependency Injection in Python

Python Pythonic Patterns Dependency Injection Testing

Null Object & Sentinels

Avoid None ambiguity with sentinels and null objects. Learn to distinguish missing data, handle default mutable arguments, and implement no-op behaviors.

Python Pythonic Patterns Sentinel Null Object

Common Anti-Patterns

Python Pythonic Patterns Anti Patterns Gotchas

Pythonic Patterns Best Practices

Learn Pythonic best practices for readable, maintainable code. Explore patterns from EAFP and with statements to dependency injection and domain events.

Python Pythonic Patterns Best Practices List

Pythonic Patterns Highlights Summary

A single-page roundup of every highlight bullet from the 11 pages in the Pythonic Patterns section, grouped by source page so you can scan all 64 takeaways without opening each article individually.

Highlights Summary Pythonic Patterns

Pythonic Patterns

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Pythonic Patterns