#NEWLINE# def call_at( self , when , callback , * args , **kwargs ) : #NEWLINE# #INDENT# 'Runs the ``callback`` at the absolute time designated by ``when``.\n\n        ``when`` must be a number using the same reference point as\n        `IOLoop.time`.\n\n        Returns an opaque handle that may be passed to `remove_timeout`\n        to cancel.  Note that unlike the `asyncio` method of the same\n        name, the returned object does not have a ``cancel()`` method.\n\n        See `add_timeout` for comments on thread-safety and subclassing.\n\n        .. versionadded:: 4.0\n        ' #NEWLINE# return self . add_timeout ( when , self , * args , ** kwargs )