HTMLify

import os
import time

download_dir = os.path.expanduser("~/Downloads/")

while True:
    filenames = os.listdir(download_dir)
    for filename in filenames:
        if filename.startswith("jpeg") and "." not in filename:
            n = 1
            while True:
                new_name = f"{n}.jpeg"
                if new_name not in os.listdir(download_dir):
                    break
                n += 1
            os.rename(download_dir + filename, download_dir + new_name)
    time.sleep(500)