human
Complete the below
def asset_controller():

    ''''RESTful CRUD controller'
    '''
assistant
#Here is the Python code you requested.
    s3db = current.s3db
    s3 = current.response.s3
    def prep(r):
        current.s3db.gis_location_filter(r)
        if (r.component_name == 'log'):
            asset_log_prep(r)
        return True
    s3.prep = prep
    def import_prep(data):
        '\n                                                Flag    that    this    is    an    Import    (to    distinguish    from    Sync)\n                                                @ToDo:    Find    Person    records    from    their    email    addresses\n                                '
        current.response.s3.asset_import = True
        return
        ctable = s3db.pr_contact
        ptable = s3db.pr_person
        (resource, tree) = data
        elements = tree.getroot().xpath("/s3xml//resource[@name='pr_person']/data[@field='first_name']")
        persons = {}
        for element in elements:
            email = element.text
            if (email in persons):
                element.text = persons[email]['uuid']
                continue
            query = ((ctable.value == email) & (ctable.pe_id == ptable.pe_id))
            person = db(query).select(ptable.uuid, limitby=(0, 1)).first()
            if person:
                uuid = person.uuid
            else:
                uuid = ''
            element.text = uuid
            persons[email] = dict(uuid=uuid)
    s3.import_prep = import_prep
    def postp(r, output):
        if (r.interactive and (r.method != 'import')):
            script = ('/%s/static/scripts/S3/s3.asset.js' % r.application)
            s3.scripts.append(script)
            S3CRUD.action_buttons(r, deletable=False)
        return output
    s3.postp = postp
    output = current.rest_controller('asset', 'asset', rheader=asset_rheader)
    return output