Can we catch a MyException?
MyException : this error should go to a custom type

Can we translate to standard Python exceptions?
RuntimeError : this error should go to a standard Python exception

Can we handle unknown exceptions?
RuntimeError : Caught an unknown exception!

Can we delegate to another handler by rethrowing?
MyException : this error is rethrown

Can we fall-through to the default handler?
RuntimeError : this error should fall through to the standard handler