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Polyfactory is a simple and powerful mock data generation library, based around type hints and supporting dataclasses, typed-dicts, pydantic models, msgspec structs and more.

Polyfactory part of the Litestar project and as such actively maintained by a community of maintainers and contributors.

from dataclasses import dataclass
from polyfactory.factories import DataclassFactory
@dataclass
class Person:
 name: str
 age: float
 height: float
 weight: float
class PersonFactory(DataclassFactory[Person]):
 ...
def test_is_person() -> None:
 person_instance = PersonFactory.build()
 assert isinstance(person_instance, Person)

That's it - with almost no work, we are able to create a mock data object fitting the Person class model definition.

This is possible because of the typing information available on the dataclass, which are used as a source of truth for data generation.

The factory parses the information stored in the dataclass and generates a dictionary of kwargs that are passed to Person.

Usage and API reference documentation is available on https://polyfactory.litestar.dev/.

pip install polyfactory

Prior to version 2, this library was known as pydantic-factories, a name under which it gained quite a bit of popularity. A main motivator for the 2.0 release was that we wanted to support more than just Pydantic models, something which also required a change to its core architecture. As this library would no longer be directly tied to Pydantic, polyfactory was chosen as its new name to reflect its capabilities; It can generate mock data for dataclasses, typed-dicts, Pydantic, odmantic, and beanie ODM models, as well as custom factories.

This library is a community driven open source project. We welcome and encourage contributions. Please check out the GitHub issues, read the contribution guide (at the repository's root), and you're always welcome to join our discord server.

Thanks goes to these wonderful people (emoji key):

This project follows the all-contributors specification. Contributions of any kind welcome!