How to use the tmuxp.exc.TmuxpException function in tmuxp

"""

        sformats = formats.SESSION_FORMATS
        tmux_formats = ['#{%s}' % f for f in sformats]

        tmux_args = (
            '-F%s' % '\t'.join(tmux_formats),   # output
        )

        proc = self.cmd(
            'list-sessions',
            *tmux_args
        )

        if proc.stderr:
            raise exc.TmuxpException(proc.stderr)
        else:
            session_info = proc.stdout[0]

        if proc.stderr:
            raise exc.TmuxpException(proc.stderr)

        sformats = formats.SESSION_FORMATS
        tmux_formats = ['#{%s}' % format for format in sformats]
        sessions = proc.stdout

        # combine format keys with values returned from ``tmux list-windows``
        sessions = [dict(zip(
            sformats, session.split('\t'))) for session in sessions]

        # clear up empty dict
        sessions = [

tmux_args = (
            '-s%s' % session_name,
            '-P', '-F%s' % '\t'.join(tmux_formats),   # output
        )

        if not attach:
            tmux_args += ('-d',)

        proc = self.cmd(
            'new-session',
            *tmux_args
        )

        if proc.stderr:
            raise exc.TmuxpException(proc.stderr)

        session = proc.stdout[0]

        if env:
            os.environ['TMUX'] = env

        # combine format keys with values returned from ``tmux list-windows``
        session = dict(zip(sformats, session.split('\t')))

        # clear up empty dict
        session = dict((k, v) for k, v in session.items() if v)

        session = Session(server=self, **session)

        return session

window_args += (
            '-F"%s"' % '\t'.join(tmux_formats),  # output
        )
        if window_name:
            window_args += ('-n%s' % window_name,)

        window_args += (
            # empty string for window_index will use the first one available
            '-t%s:%s' % (self.get('session_id'), window_index),
        )

        proc = self.cmd('new-window', *window_args)

        if proc.stderr:
            raise exc.TmuxpException(proc.stderr)

        window = proc.stdout[0]

        window = dict(zip(wformats, window.split('\t')))

        # clear up empty dict
        window = dict((k, v) for k, v in window.items() if v)
        window = Window(session=self, **window)

        self.server._update_windows()

        return window

set_layout_hook(builder.session, 'client-attached')
                    set_layout_hook(builder.session, 'client-session-changed')

                sys.exit('Session created in detached state.')
        else:  # tmuxp ran from inside tmux
            if has_gte_version('2.6'):
                # if attaching for first time
                set_layout_hook(builder.session, 'client-attached')

                # for cases where user switches client for first time
                set_layout_hook(builder.session, 'client-session-changed')

            if not detached:
                builder.session.attach_session()

    except exc.TmuxpException as e:
        import traceback

        click.echo(traceback.format_exc(), err=True)
        click.echo(e, err=True)

        choice = click.prompt(
            'Error loading workspace. (k)ill, (a)ttach, (d)etach?',
            value_proc=_validate_choices(['k', 'a', 'd']),
            default='k',
        )

        if choice == 'k':
            builder.session.kill_session()
            click.echo('Session killed.')
        elif choice == 'a':
            if 'TMUX' in os.environ:

def build(self, session=None):
        """Build tmux workspace in session.

        Optionally accepts ``session`` to build with only session object.

        Without ``session``, it will use :class:`Server` at ``self.server``
        passed in on initialization to create a new Session object.

        :param session: - session to build workspace in
        :type session: :class:`Session`

        """

        if not session:
            if not self.server:
                raise exc.TmuxpException(
                    'WorkspaceBuilder.build requires server to be passed ' +
                    'on initialization, or pass in session object to here.'
                )

            if self.server.has_session(self.sconf['session_name']):
                self.session = self.server.findWhere(
                    {
                        'session_name': self.sconf['session_name']
                    }
                )
                raise exc.TmuxSessionExists(
                    'Session name %s is already running.' %
                    self.sconf['session_name']
                )
            else:
                session = self.server.new_session(

def attach_session(self, target_session=None):
        """``$ tmux attach-session`` aka alias: ``$ tmux attach``.

        :param: target_session: str. name of the session. fnmatch(3) works.

        """
        tmux_args = tuple()
        if target_session:
            tmux_args += ('-t%s' % target_session,)

        proc = self.cmd('attach-session', *tmux_args)

        if proc.stderr:
            raise exc.TmuxpException(proc.stderr)