How to use the pywws.storage.PywwsContext function in pywws

for o, a in opts:
        if o in ('-h', '--help'):
            print(__usage__.strip(), file=sys.stderr)
            return 0
    # check arguments
    if len(args) != 2:
        print('Error: 2 arguments required\n', file=sys.stderr)
        print(__usage__.strip(), file=sys.stderr)
        return 2
    # process arguments
    in_name = args[0]
    out_name = args[1]
    # open input
    in_file = open(in_name, 'r')
    # open data store via PywwsContext
    ds = pywws.storage.PywwsContext(out_name,False).raw_data
    # get time to go forward to
    first_stored = ds.after(datetime.min)
    if first_stored == None:
        first_stored = datetime.max
    # copy any missing data
    last_date = None
    count = 0
    for line in in_file:
        items = line.split(',')
        local_date = datetime.strptime(items[2].strip(), '%Y-%m-%d %H:%M:%S')
        local_date = pywws.timezone.Local.localize(local_date)
        date = local_date.astimezone(pywws.timezone.utc)
        if last_date and date < last_date:
            date = date + timedelta(hours=1)
            print("Corrected DST ambiguity %s %s -> %s" % (
                local_date, local_date.tzname(), date))

if o == '-h' or o == '--help':
            print(__usage__.strip())
            return 0
        elif o == '-n' or o == '--noaction':
            noaction = True
    # check arguments
    if len(args) != 1:
        print('Error: 1 argument required\n', file=sys.stderr)
        print(__usage__.strip(), file=sys.stderr)
        return 2
    data_dir = args[0]
    # date & time range of data to be changed, in UTC!
    start = datetime(2013, 10, 27, 11, 21)
    stop  = datetime(2013, 10, 29, 18, 32)
    # open data store via PywwsContext
    context = pywws.storage.PywwsContext(data_dir,False)
    raw_data = context.raw_data
    # process the data
    aperture = timedelta(minutes=14, seconds=30)
    # make list of changes to apply after examining the data
    changes = []
    for data in raw_data[start:stop]:
        if data['temp_out'] is None:
            continue
        # get temperatures at nearby times
        idx = data['idx']
        temp_list = []
        for local_data in raw_data[idx-aperture:idx+aperture]:
            temp = local_data['temp_out']
            if temp is not None:
                temp_list.append(temp)
        if len(temp_list) < 3:

# process options
    for o, a in opts:
        if o == '-h' or o == '--help':
            print(__usage__.strip())
            return 0
    # check arguments
    if len(args) != 1:
        print('Error: 1 argument required\n', file=sys.stderr)
        print(__usage__.strip(), file=sys.stderr)
        return 2
    data_dir = args[0]
    # date & time range of data to be changed, in UTC!
    start = datetime(2013, 10, 26, 15, 23)
    stop  = datetime(2013, 10, 30, 12, 47)
    # open data store via PywwsContext
    context = pywws.storage.PywwsContext(data_dir,False)
    raw_data = context.raw_data
    # change the data
    for data in raw_data[start:stop]:
        data['rain'] -= 263.1
        raw_data[data['idx']] = data
    # make sure it's saved
    raw_data.flush()
    # clear calibrated data that needs to be regenerated
    calib_data = context.calib_data
    del calib_data[start:]
    calib_data.flush()
    # done
    return 0