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#async (14)

Cheat sheets (14)

anyio — Structured Concurrency Across asyncio and trio

Package-level reference for anyio on PyPI — install, version policy, task groups, cancel scopes, and the API that runs identically on asyncio and trio.
pip package async concurrency networking

fastapi — Modern ASGI API Framework

Package-level reference for FastAPI on PyPI — install variants, version policy, the `[all]` extra, ecosystem companions, and alternatives.
pip package web async api

httpx — Async-Capable HTTP Client

Package-level reference for httpx on PyPI — install variants, version policy, extras, transport options, and alternatives.
pip package http async networking

litestar — High-Performance ASGI Framework

Package-level reference for Litestar on PyPI — install variants, version policy, the `[full]` extra, ecosystem companions, and alternatives.
pip package web async api

semantic-kernel — Microsoft's LLM Orchestration SDK

Package-level reference for semantic-kernel on PyPI — install variants, the Python vs .NET split, provider extras, and alternative frameworks.
pip package ai agents async

tqdm — Fast, Extensible Progress Bars

Package-level reference for tqdm on PyPI — install variants, notebook extra, version policy, and alternatives.
pip package progress cli async

Claude API — Message Batches

The Anthropic Message Batches API — create, poll, retrieve, and stream results at 50% off list price for asynchronous bulk processing of thousands of Claude requests.
claude api anthropic batch batches bulk async cost-optimization

Claude API — Streaming

Streaming responses from the Anthropic API — server-sent events, event types, async iteration in Python and TypeScript, partial tool input, error handling, and retry strategies.
claude api anthropic streaming sse server-sent-events async

fastapi — Fast ASGI API Framework

Build high-performance async REST APIs with FastAPI. Covers path params, request bodies, Pydantic models, dependency injection, and auto-generated OpenAPI docs.
python fastapi api async asgi rest openapi pydantic

httpx — Modern HTTP Client

Make sync and async HTTP requests with httpx. Covers GET/POST, async usage, HTTP/2, streaming, and how it compares to requests.
python httpx http api async networking

tqdm — Progress Bars

Add auto-updating progress bars to any Python loop or CLI pipeline with tqdm. Covers iterables, manual updates, pandas integration, nested bars, async, Jupyter, and byte-piping.
python tqdm progress cli jupyter async

Async / Await

async/await syntax, error handling, parallel execution with Promise.all, sequential vs parallel loops, top-level await, AbortController, and common mistakes.
javascript async promises language

Promises

JavaScript Promises represent the eventual completion or failure of an async operation. Covers states, chaining, combinators, callback conversion, AbortController, and common anti-patterns.
javascript promises async language

asyncio — Async I/O

Write concurrent Python code with asyncio. Covers coroutines, asyncio.run, gather, create_task, timeouts, queues, and avoiding the blocking-call pitfall.
python asyncio async await concurrency coroutines