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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def import_(name, path, mode='import', nodataset=False, brand_opts=None):
    '''
    Import a zones configuration

    name : string
        name of the zone
    path : string
        path of the configuration file to import
    mode : string
        either import, install, or attach
    nodataset : boolean
        do not create a ZFS file system
    brand_opts : boolean
        brand specific options to pass

    .. note::
        The mode argument can be set to ``import``, ``install``, or ``attach``.
        ``import``: will only import the configuration
        ``install``: will import and then try to install the zone
        ``attach``: will import and then try to attach of the zone

    .. code-block:: yaml

        omipkg1:
          zone.import:
            - path: /foo/bar/baz
    '''
    ret = {'name': name,
           'changes': {},
           'result': None,
           'comment': ''}

    zones = __salt__['zoneadm.list'](installed=True, configured=True)
    if name not in zones:
        if __opts__['test']:
            ret['result'] = True
            ret['comment'] = 'Zone {0} was imported from {1}.'.format(
                name,
                path,
            )
            ret['changes'][name] = 'imported'
        else:
            if __salt__['file.file_exists'](path):
                res_import = __salt__['zonecfg.import'](name, path)
                if not res_import['status']:
                    ret['result'] = False
                    ret['comment'] = 'Unable to import zone configuration for {0}!'.format(name)
                else:
                    ret['result'] = True
                    ret['changes'][name] = 'imported'
                    ret['comment'] = 'Zone {0} was imported from {1}.'.format(
                        name,
                        path,
                    )
                    if mode.lower() == 'attach':
                        res_attach = __salt__['zoneadm.attach'](name, False, brand_opts)
                        ret['result'] = res_attach['status']
                        if res_attach['status']:
                            ret['changes'][name] = 'attached'
                            ret['comment'] = 'Zone {0} was attached from {1}.'.format(
                                name,
                                path,
                            )
                        else:
                            ret['comment'] = []
                            ret['comment'].append('Failed to attach zone {0} from {1}!'.format(
                                name,
                                path,
                            ))
                            if 'message' in res_attach:
                                ret['comment'].append(res_attach['message'])
                            ret['comment'] = "\n".join(ret['comment'])
                    if mode.lower() == 'install':
                        res_install = __salt__['zoneadm.install'](name, nodataset, brand_opts)
                        ret['result'] = res_install['status']
                        if res_install['status']:
                            ret['changes'][name] = 'installed'
                            ret['comment'] = 'Zone {0} was installed from {1}.'.format(
                                name,
                                path,
                            )
                        else:
                            ret['comment'] = []
                            ret['comment'].append('Failed to install zone {0} from {1}!'.format(
                                name,
                                path,
                            ))
                            if 'message' in res_install:
                                ret['comment'].append(res_install['message'])
                            ret['comment'] = "\n".join(ret['comment'])
            else:
                ret['result'] = False
                ret['comment'] = 'The file {0} does not exists, unable to import!'.format(path)
    else:
        ## zone exist
        ret['result'] = True
        ret['comment'] = 'Zone {0} already exists, not importing configuration.'.format(name)

    return ret