> did you know __init__.py is optional nowadays? It's not optional. Omitting it gets you a namespace package, which is probably not what you want. > TypeVar s

> did you know __init__.py is optional nowadays? It's not optional. Omitting it gets you a namespace package, which is probably not what you want. > TypeVar supports binding to enforce subtypes: "TypeVar['T', bound=X]", Using the new generics syntax you mentioned above you can now do: def method[T: X](...)