##
7.5.7 Timer Objects

This class represents an action that should be run only after a certain amount of time has passed -- a timer. `Timer` is a subclass of `Thread` and as such also functions as an example of creating custom threads.

Timers are started, as with threads, by calling their `start()` method. The timer can be stopped (before its action has begun) by calling the `cancel()` method. The interval the timer will wait before executing its action may not be exactly the same as the interval specified by the user.

For example:

      def hello():
          print "hello, world"

      t = Timer(30.0, hello)
      t.start() # after 30 seconds, "hello, world" will be printed

class `Timer`(interval, function, args=[], kwargs={})
  Create a timer that will run function with arguments args and keyword arguments kwargs, after interval seconds have passed.

`cancel`()
  Stop the timer, and cancel the execution of the timer's action. This will only work if the timer is still in its waiting stage.