<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _wrapped_method_with_watch_fn(self, f, *args, **kwargs):
 """A wrapped method with a watch function. When this method is called, it will call the underlying method with the same arguments, *except* that if the ``watch`` argument isn't :data:`None`, it will be replaced with a wrapper around that watch function, so that the watch function will be called in the reactor thread. This means that the watch function can safely use Twisted APIs. """

        bound_args = signature(f).bind(*args, **kwargs)
        orig_watch = bound_args.arguments.get("watch")

        if orig_watch is not None:
            wrapped_watch = partial(self._call_in_reactor_thread, orig_watch)
            wrapped_watch = wraps(orig_watch)(wrapped_watch)
            bound_args.arguments["watch"] = wrapped_watch

        return f(**bound_args.arguments)