Python reference library
Python
cheat sheets.
Web APIs, validation, data pipelines, databases, and tests. These references cover FastAPI, Pydantic, Polars, SQLAlchemy, and pytest.
Python
FastAPI
Python web APIs
Routes, request validation, dependencies, SQLAlchemy, authentication, and testing.
ValidationDependenciesAuth
8 chapters 28 topicsExplore
Python
Pydantic & core
Data validation and serialization
Models, validators, serialization, settings, custom types, and pydantic-core.
Models & validationSerializationpydantic-core
5 chapters 44 topicsExplore
Python
Polars
DataFrames and data pipelines
Expressions, joins, file formats, reporting, lazy queries, and streaming.
Expressions & joinsLazy queriesFile pipelines
7 chapters 50 topicsExplore
Python
SQLAlchemy
ORM queries and transactions
Models, queries, relationships, and transactions, with matching SQL examples.
QueriesRelationshipsAsyncIO
4 chapters 27 topicsExplore
Python
pytest
Python tests and fixtures
Assertions, fixtures, parametrization, mocks, async tests, and plugins.
FixturesMocksPlugins
4 chapters 26 topicsExplore