What is the "..." in python?

Question

I saw this ellipsis / three-point statement in aiohttp :

  if debug is ...: debug = loop.get_debug() 

• What is called and what is he doing?
• Is this some kind of destructive or common operator?
• And how is it different from **some_kwargs and *some_args ?

Decision

In this particular case:

 >>> ... Ellipsis >>> x = Ellipsis >>> x is ... True >>> ... is ... True 

code:

• https://github.com/KeepSafe/aiohttp/blob/master/aiohttp/web.py#L46-L47