[benrbray]

Is there something like DefinitelyTyped for Python? TypeScript only became useful once the ecosystem reached a critical mass of type definitions available for popular libraries.

At the moment the Python community seems pretty anti-static-types, and the core scientific libraries (numpy, matplotlib, pytorch) don't export type signatures. Language server / intellisense support for type inference also has a long way to go.

[vorticalbox]

Not that I am aware of. You can create you own types like what has happened with boto3 [1]

I would assume as types become used more a definitely typed type project will happen on pypi.

[1] https://pypi.org/project/boto3-type-annotations/