How to use the ipython.launch.get_mppalloc function in ipython

directory = dirname(interactive.jobfolder_path)
    job = interactive.jobfolder
    name = interactive.jobfolder.name[1:]
    if job.functional is None:
        print("Current jobfolder does not contain any calculation.")
        return
    # avoid successful jobs.unless specifically requested
    if hasattr(job.functional, 'Extract') and not event.force:
        p = join(directory, name)
        extract = job.functional.Extract(p)
        if extract.success:
            print("Job {0} completed successfully. "                                 \
                  "It will not be relaunched.".format(name))
            return
    # now creates script
    pbsargs['n'] = get_mppalloc(shell, event, False)
    pbsargs['nnodes'] = (pbsargs['n'] + pbsargs['ppn'] - 1)                      \
        // pbsargs['ppn']
    pbsargs['err'] = pbspaths(directory, name, 'err')
    pbsargs['out'] = pbspaths(directory, name, 'out')
    pbsargs['name'] = name if len(name)                                          \
        else "{0}-root".format(basename(path))
    pbsargs['directory'] = directory
    pbsargs['header'] = ""
    pbsargs['header'] += '\nexport PYLADA_JOBARRAY_NAME={0!r}\n'.format(name)
    pbsargs['scriptcommand'] = "{0} --nbprocs {n} --ppn {ppn} {1} "              \
                               .format(pyscript, path, **pbsargs)
    pbsscript = pbspaths(directory, name, 'script')

    local_path(directory).join(name).ensure(dir=True)
    with open(pbsscript, "w") as file:
        string = pbs_string(**pbsargs) if hasattr(pbs_string, '__call__')          \

from .. import logger

    if not hasattr(pylada, 'ipython_qstat'):
        logger.warning("Missing ipython_qstat function: cannot check for jobs already in queue")
        qstat = lambda x: []
    else:
        qstat = lambda x: self.qstat(x)

    logger.info("launch/scattered: event: %s" % event)
    shell = get_shell(self)

    pbsargs = deepcopy(dict(default_comm))
    pbsargs.update(default_pbs)
    pbsargs['ppn'] = event.ppn

    mppalloc = get_mppalloc(shell, event)
    if mppalloc is None:
        return

    # Set pbsargs['walltime'] to a string like '03:59:59'
    if not get_walltime(shell, event, pbsargs):
        return

    # Set pbsargs['queue'], pbsargs['account']
    if not get_queues(shell, event, pbsargs):
        return
    logger.info("launch/scattered: pbsargs: %s" % pbsargs)

    # gets python script to launch in pbs.
    pyscript = scattered_script.__file__
    logger.info("launch/scattered: pyscript: %s" % pyscript)
    if pyscript[-1] == 'c':