Print the BoxUsage and approximate costs of all requests made on
        this specific SDBConnection instance.
        
        .. tip:: This can be out of date, and should only be treated as a
            rough estimate. Also note that this estimate only applies to the
            requests made on this specific connection instance. It is by
            no means an account-wide estimate.

def print_usage(self):
        """
        Print the BoxUsage and approximate costs of all requests made on
        this specific SDBConnection instance.
        
        .. tip:: This can be out of date, and should only be treated as a
            rough estimate. Also note that this estimate only applies to the
            requests made on this specific connection instance. It is by
            no means an account-wide estimate.
        """
        print 'Total Usage: %f compute seconds' % self.box_usage
        cost = self.box_usage * 0.14
        print 'Approximate Cost: $%f' % cost