Developer
cheat sheets.

HTTP routing and middleware

Routing, extractors, shared state, SQLx, SeaORM, authentication, and deployment.

Async tasks, channels, and I/O

Futures, tasks, channels, timers, cancellation, networking, and graceful shutdown.

Command-line argument parsing

Typed arguments, subcommands, validation, help text, shell completions, and CLI tests.

Python web APIs

Routes, request validation, dependencies, SQLAlchemy, authentication, and testing.

Data validation and serialization

Models, validators, serialization, settings, custom types, and pydantic-core.

DataFrames and data pipelines

Expressions, joins, file formats, reporting, lazy queries, and streaming.

ORM queries and transactions

Models, queries, relationships, and transactions, with matching SQL examples.

Python tests and fixtures

Assertions, fixtures, parametrization, mocks, async tests, and plugins.