@property<EOL><INDENT>def status(self):<DEDENT>
return self._status<EOL>
The status of the TransferFuture

        The currently supported states are:
            * not-started - Has yet to start. If in this state, a transfer
              can be canceled immediately and nothing will happen.
            * queued - SubmissionTask is about to submit tasks
            * running - Is inprogress. In-progress as of now means that
              the SubmissionTask that runs the transfer is being executed. So
              there is no guarantee any transfer requests had been made to
              S3 if this state is reached.
            * cancelled - Was cancelled
            * failed - An exception other than CancelledError was thrown
            * success - No exceptions were thrown and is done.