human
Give me a the Python code you requested given the following:
Complete the below
@gen.engine
def ProcessFiles(merged_store, filenames, callback):

    ''''Fetch and process each file contained in \'filenames\'.'
    '''
assistant
#Here is the Python code you requested.
    @gen.engine
    def _ProcessOneFile(contents, day_stats):
        'Iterate    over    the    contents    of    a    processed    file:    one    entry    per    line.    Increment    stats    for    specific    entries.'
        buf = cStringIO.StringIO(contents)
        buf.seek(0)
        ui_events = Counter()
        while True:
            line = buf.readline()
            if (not line):
                break
            parsed = json.loads(line)
            if (not parsed):
                continue
            if ('version' not in parsed):
                continue
            payload = parsed['payload']
            if ('name' in payload):
                if ((payload['name'] == '/assets/scan') and (payload['type'] == 'full')):
                    day_stats.AddScan(parsed['version'], payload['num_scanned'], payload['elapsed'])
                elif payload['name'].startswith('/ui/'):
                    ui_events[payload['name']] += 1
        if ui_events:
            ui_events['/ui/anything'] += 1
        day_stats.AddEvents(ui_events)
        buf.close()
    today = util.NowUTCToISO8601()
    files_by_day = defaultdict(list)
    for filename in filenames:
        (_, day, user) = filename.split('/')
        if (options.options.compute_today or (today != day)):
            files_by_day[day].append(filename)
    stats_by_day = {}
    for day in sorted(files_by_day.keys()):
        files = files_by_day[day]
        day_stats = DayStats(day)
        for f in files:
            contents = ''
            try:
                contents = (yield gen.Task(merged_store.Get, f))
            except Exception as e:
                logging.error(('Error    fetching    file    %s:    %r' % (f, e)))
                continue
            _ProcessOneFile(contents, day_stats)
        if (len(day_stats._long_scan_speeds) == 0):
            continue
        dd = DotDict()
        for p in [1, 5, 10, 25, 50, 75, 90, 95, 99]:
            dd[('user_analytics.scans_gt1s_speed_percentile.%.2d' % p)] =...