Pydantic is a data validation library for Python that has seen massive adoption over the last few years - it is estimated that Pydantic is now used by about 10% of professional web developers! Over the last year I've been working full time to rebuild Pydantic from the ground up, using Rust for virtually all the validation and serialization logic. Pydantic V2, with these changes included, will be released early in 2023. In this talk I will give a brief introduction to Pydantic V2 before diving into how the use of Rust has allowed us to completely change the architecture of Pydantic to make it easier to extend and maintain while also improving performance significantly. The majority of the talk will be devoted to using examples from the pydantic V2 code base (rust and python) to demonstrate the advantages (and disadvantages) of writing libraries like Pydantic in Rust. This talk should be interesting to any Rust or Python developer who's interested in combining the two languages - no knowledge of Python or Pydantic is required.