'Return the callbacks associated with this name.
Args:
callback_name (str): the name of the callback.
Returns:
A list of callbacks associated with this object and of this name.
Note:
This method returns a list of callback objects (namedtuple
representations).  If the callback name cannot be found in the
object\'s callbacks, return an empty list.'

def get(self, callback_name):

    return self.all().get(callback_name, [])
