Pydantic v2 cheatsheets. Pair with the textbook .
Pydantic Cheatsheet 01 — BaseModel Basics
Cheatsheet: BaseModel definition, model_validate, model_dump, model_config.
Pydantic v2 Cheatsheets
Quick-reference cheatsheets for Pydantic v2 — fields, validators, serialization, types, settings.
Pydantic Cheatsheet 02 — Field and Constraints
Cheatsheet: Field options, constraints (min/max/gt/le/pattern), defaults, default_factory, aliases.
Pydantic Cheatsheet 03 — Validators
Cheatsheet: field_validator (mode=before/after), model_validator, BeforeValidator/AfterValidator, ValidationInfo.
Pydantic Cheatsheet 04 — Serialization
Cheatsheet: model_dump, exclude/include/exclude_none/exclude_unset, field_serializer, model_serializer.
Pydantic Cheatsheet 05 — Discriminated Unions and Generics
Cheatsheet: discriminator field, callable Discriminator, Generic[T] models, recursive references.
Pydantic Cheatsheet 06 — Custom Types and TypeAdapter
Cheatsheet: custom types via Annotated, GetCoreSchemaHandler, RootModel, TypeAdapter, dataclass integration.
Pydantic Cheatsheet 07 — Strict vs Lax Mode
Cheatsheet: lax default, strict per model / field / call, bool-is-int gotcha, JSON vs dict input.
Pydantic Cheatsheet 08 — Aliases (Input/Output Field Names)
Cheatsheet: alias variants, populate_by_name, AliasChoices for multi-alias, AliasPath for nested input.
Pydantic Cheatsheet 09 — pydantic-settings
Cheatsheet: BaseSettings, env_file, env_prefix, nested, secrets_dir, CLI integration.
Pydantic Cheatsheet 10 — JSON Schema and OpenAPI
Cheatsheet: model_json_schema modes, json_schema_extra, custom JSON Schema, LLM tools.