'Returns the BoxUsage (in USD) accumulated 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 tip:: This can be out of date, and should only be treated as a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.
:rtype: float
:return: The accumulated BoxUsage of all requests made on the connection.'

def get_usage(self):

    return self.box_usage
