docs: def apply(self, coro_function, args=None, kwargs=None, callback=None):
          """Submit a coro_function(*args, **kwargs) as NewTask to self.loop with loop.frequncy control.
  
          ::
  
              from torequests.dummy import Loop
              import asyncio
              loop = Loop()
  
              async def test(i):
                  result = await asyncio.sleep(1)
                  return (loop.frequency, i)
  
              task = loop.apply(test, [1])
              print(task)
              # loop.x can be ignore
              loop.x
              print(task.x)
  
              # <NewTask pending coro=<new_coro_func() running at torequests/torequests/dummy.py:154>>
              # (Frequency(sem=<0/0>, interval=0, name=loop_sem), 1)
          """
          args = args or ()
          kwargs = kwargs or {}
          coro = self._wrap_coro_function_with_sem(coro_function)(*args, **kwargs)
          return self.submit(coro, callback=callback)