Python

I don’t like having to quote the types, so I use it exclusively for avoiding circular imports.

I only use it to avoid circular imports. Otherwise, I can import the type plainly.

Any time you need different behavior between static type checking and runtime.

in 3.10 I’m using it to work around issue with NamedTuple generics. typing_extensions.NamedTuple allows Generics at runtime but typing.NamedTuple doesn’t. But the type checker we are using doesn’t support typing_extensions.NamedTuple like it does for the typing version so we lie at type checking time to get the typing to make sense but have different runtime type because otherwise its a TypeError