TimeElapse (untested)

#!/usr/bin/env python3

import time
from argparse import ArgumentParser
from itertools import count
from pathlib import Path
from typing import Iterator, Optional

from picamera import PiCamera

FORMATS = "jpeg png gif bmp yuv rgb rgba bgr bgra".split()


def setup_camera(width, height):
    camera = PiCamera()
    camera.resolution(width, height)
    return camera


def main(
    interval: float,
    directory: Path,
    name: str,
    start: int,
    img_format: str,
    frames: Optional[int],
    height: int,
    width: int,
    preview: Optional[bool],
):
    camera = setup_camera(width, height)
    iterator = range(start, start + frames) if frames else count(start)

    if preview:
        camera.start_preview()
        print("Preview", width, "x", height, format)

    with camera:
        for number in iterator:

            target = directory / f"{name}_{number:04d}.{img_format}"
            time.sleep(interval)
            camera.capture(str(target))
            print(target)


def get_args():
    parser = ArgumentParser()
    parser.add_argument(
        "directory", type=Path, help="Base directory where to put the files"
    )
    parser.add_argument("name", help="name of file without .jpg suffix")
    parser.add_argument(
        "-i", "--interval", default=2.0, type=float, help="interval in seconds"
    )
    parser.add_argument(
        "-f",
        "--format",
        dest="img_format",
        default="jpg",
        choices=FORMATS,
        help="Format of file",
    )
    parser.add_argument("--frames", default=None, type=int, help="Limit the frames")
    parser.add_argument(
        "--start", default=0, type=int, help="Offset where to start the counting"
    )
    parser.add_argument("--width", default=4056, type=int, help="Width of image")
    parser.add_argument("--height", default=3040, type=int, help="Height of image")
    parser.add_argument("-p", "--preview", action="store_true", help="Preview")
    return parser.parse_args()


if __name__ == "__main__":
    args = get_args()

    try:
        main(**vars(args))
    except KeyboardInterrupt:
        pass