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An utility class for creating instances of dataclasses

Project description


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dataclass_factory is a modern way to convert dataclasses or other objects to and from more common types like dicts


See documentation for more details.



pip install dataclass_factory


from dataclasses import dataclass
import dataclass_factory

class Book:
    title: str
    price: int
    author: str = "Unknown author"

data = {
    "title": "Fahrenheit 451",
    "price": 100,

factory = dataclass_factory.Factory()
book: Book = factory.load(data, Book)  # Same as Book(title="Fahrenheit 451", price=100)
serialized = factory.dump(book) 


  • python >= 3.6

You can use dataclass_factory with python 3.6 and dataclass library installed from pip.

On python 3.7 it has no external dependencies outside of the Python standard library.


  • No schemas or configuration needed for simple cases. Just create Factory and call load/dump methods
  • Speed. It is up to 10 times faster than marshmallow and dataclasses.asdict (see benchmarks)
  • Automatic name style conversion (e.g. snake_case to CamelCase)
  • Automatic skipping of "internal use" fields (with leading underscore)
  • Enums, typed dicts, tuples and lists are supported out of the box
  • Unions and Optionals are supported without need to define them in schema
  • Generic dataclasses can be automatically parsed as well
  • Cyclic-referenced structures (such as linked-lists or trees) also can be converted
  • Validators, custom parser steps are supported.
  • Multiple schemas for single type can be provided to support different ways of parsing of the same type

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