I'm currently trying to type an API using the signal module. At some point, we pass a callback that has the type signal._Handler (see: https://github.com/python/typeshed/blob/master/stdlib/3/signal.pyi#L73), which is not in the signal module, but in typeshed.

If I try to import it, I get an error, and I could not find the proper way to do so in the documentation.