p = argparse.ArgumentParser()
p.add_argument(
    "-f",
    "--from-file",
    dest="infile",
    help="Read samples from the given filename and process them",
)
p.add_argument(
    "-db",
    "--database",
    dest="db",
    default=None,
    help="SQLite database where to store processed results. Defaults to `main.db`. Environment variable KIWITRACKER_DB has priority.",
)

p.add_argument(
    "-d",
    "--delete-database",
    dest="deletedb",
    action="store_true",
    help="If SQLite database file exists upon start, it is deleted.",
)

p.add_argument(
    "-o",
    "--outfile",
    dest="outfile",
    help="Read samples from the device and save to the given filename",
)
p.add_argument(
    "-m",
    "--max-samples",
    dest="max_samples",
    type=int,
    help='Number of samples to read when "-o/--outfile" is specified',
)
p.add_argument(
    "--scan",
    dest="scan",
    action="store_true",
    help="Scan for frequencies in first 3sec",
)
p.add_argument(
    "--no-use-gps",
    dest="no_use_gps",
    action="store_true",
    help="Set this flag to not use GPS module",
)
p.add_argument(
    "--radio",
    default="rtl",
    const="rtl",
    nargs="?",
    choices=["rtl", "airspy", "dummy"],
    help="type of radio to be used (default: %(default)s), ignored if reading samples from disk.",
)

s_group = p.add_argument_group("Sampling")
s_group.add_argument(
    "-c",
    "--chunk-size",
    dest="chunk_size",
    type=int,
    default=SampleConfig.read_size,
    help="Chunk size for sdr.read_samples (default: %(default)s)",
)
s_group.add_argument(
    "-s",
    "--sample-rate",
    dest="sample_rate",
    type=float,
    default=SampleConfig.sample_rate,
    help="SDR sample rate (default: %(default)s)",
)
s_group.add_argument(
    "--center-freq",
    dest="center_freq",
    type=float,
    default=SampleConfig.center_freq,
    help="SDR center frequency (default: %(default)s)",
)
s_group.add_argument(
    "-g",
    "--gain",
    dest="gain",
    type=float,
    default=SampleConfig.gain,
    help="SDR gain (default: %(default)s)",
)
s_group.add_argument(
    "--bias-tee",
    dest="bias_tee",
    action="store_true",
    help="Enable bias tee",
)

s_group.add_argument(
    "-log", "--loglevel", default="warning", help="Provide logging level. Example --loglevel debug, default=warning"
)

p_group = p.add_argument_group("Processing")
p_group.add_argument(
    "--carrier",
    dest="carrier",
    type=float,
    nargs="?",
    const=ProcessConfig.carrier_freq,
    # default=ProcessConfig.carrier_freq,
    help="Carrier frequency to process (default: %(default)s)",
)

args = p.parse_args()

Output:
$ myproject -h

usage: myproject [-h] [-f INFILE] [-o OUTFILE] [-m MAX_SAMPLES] [-c CHUNK_SIZE] [-s 
SAMPLE_RATE] [--center-freq CENTER_FREQ] [-g GAIN] [--bias-tee] [--carrier CARRIER]

options:
  -h, --help            show this help message and exit
  -f INFILE, --from-file INFILE
                    Read samples from the given filename and process them
  -o OUTFILE, --outfile OUTFILE
                    Read samples from the device and save to the given filename
  -m MAX_SAMPLES, --max-samples MAX_SAMPLES
                    Number of samples to read when "-o/--outfile" is specified

Sampling:
  -c CHUNK_SIZE, --chunk-size CHUNK_SIZE
                    Chunk size for sdr.read_samples (default: 65536)
  -s SAMPLE_RATE, --sample-rate SAMPLE_RATE
                    SDR sample rate (default: 1024000.0)
  --center-freq CENTER_FREQ
                    SDR center frequency (default: 160270968)
  -g GAIN, --gain GAIN  SDR gain (default: 7.7)
  --bias-tee            Enable bias tee

Processing:
  --carrier CARRIER     Carrier frequency to process (default: 160270968)