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Source: z2h.fyi/cheatsheets/python-advanced — Zero to Hero cheatsheets for developers.

Python Advanced

Quick Overview

Python 3.12 introduces powerful features like structural pattern matching, precise type hints, and native async support. These let you write cleaner, more performant code.

Getting Started

• Install Python 3.12 (pyenv install 3.12).
• Enable from __future__ import annotations for postponed evaluation of annotations.

Core Concepts

Concept	Description
Type Hints	Static typing with typing module.
Async/Await	Concurrency with async def and await.
Context Managers	Manage resources with with statement.
Metaclasses	Customize class creation.
Pattern Matching	match/case syntax for structural matching.

Essential Commands / Syntax

• def func(arg: int) -> str: …
• async def fetch(url): response = await aiohttp.get(url)
• class MyMeta(type): …
• with open('file.txt') as f: …
• match obj: case {'type': 'A'}: … case _ : …

Common Patterns

• Async HTTP client – use aiohttp with proper exception handling.
• Resource cleanup – custom context manager via __enter__/__exit__.
• Dynamic class creation – metaclass to auto‑register subclasses.

Gotchas & Tips

• Avoid over‑annotating; keep type hints readable.
• Remember that async functions must be awaited; forgetting to do so creates un-awaited coroutines.
• Metaclasses can be hard to debug; prefer class decorators when possible.

Next Steps

• Read the official Python 3.12 release notes.
• Take the “Advanced Python” course on Pluralsight.