<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def spawn(func, *args, **kwargs):
 """Spawn a new fiber. A new :class:`Fiber` is created with main function *func* and positional arguments *args*. The keyword arguments are passed to the :class:`Fiber` constructor, not to the main function. The fiber is then scheduled to start by calling its :meth:`~Fiber.start` method. The fiber instance is returned. """

    fiber = Fiber(func, args, **kwargs)
    fiber.start()
    return fiber