I use attrs instead of pydantic

1. mashumaro

   1 3 854 7.8 Python

   Fast and well tested serialization library

   

   Having run into these issues with Pydantic, we've been using Mashumaro[1], which, while not having all the bells and whistles of Pydantic, has served us pretty well.

   1: https://github.com/Fatal1ty/mashumaro

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3. datamodel-code-generator

   2 9 3,259 9.1 Python

   Pydantic model and dataclasses.dataclass generator for easy conversion of JSON, OpenAPI, JSON Schema, and YAML data sources.

   

   had generally good experience creating typed wrappers for api's with json-schema-to-pydantic[0] converter

   [0] https://github.com/koxudaxi/datamodel-code-generator

4. typing

   3 42 1,663 8.6 Python

   Python static typing home. Hosts the documentation and a user help forum.

   

   Mypy allows that because initial versions of PEP-484 allowed that. This has changed; here's the current wording on the PEP:

   > This is no longer the recommended behavior. Type checkers should move towards requiring the optional type to be made explicit.

   https://www.python.org/dev/peps/pep-0484/#id29

5. pydantic

   4 180 24,220 9.8 Python

   Data validation using Python type hints

   

   >I didn't know about the performance differences. Sam Colvin strikes me as very thorough and the community is very involved, so I don't think the benchmarks claiming pydantic faster than attrs is wrong. I know pydantic uses cython under the hood (no idea what) - is it possible that environmental differences are causing the discrepancy?

   If I'm reading this issue right the benchamrks in the pydantic docs are misleading https://github.com/samuelcolvin/pydantic/pull/1568

   Also

6. cattrs

   5 7 910 8.2 Python

   Composable custom class converters for attrs, dataclasses and friends.

   

   ```

   Cattrs has some problems with generics [1] [2]. Dacite and marshmallow-dataclasses don't support generics well either, with some issues around Union types.

   They do work well for simple python types but what I'd like to see is guarantee that the serialisation operation is completely reversible and if not raise warning/exception.

   [1] https://github.com/Tinche/cattrs/issues/149

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