YouTube Downloader, something like this happens when you're out of idea's.

main.py

import youtube_dl, json, os, argparse
from pathlib import Path

class Config:
  def __init__(self):
    self.location = str(Path.joinpath(Path.home(), "Downloads"))
    self.format = "mp3"

  @staticmethod
  def check_config():
    return os.path.isfile("config.json")

  def save_config(self):
    file = open("config.json", "w+")
    file.write(json.dumps(self, default=lambda o: o.__dict__, indent=4))
    file.close()

  def load_config(self):
    if (self.check_config()):
      file = open("config.json", "r")
      self.__dict__ = json.loads(file.read())
      file.close()

class Download:
  @staticmethod
  def audio(url):
    youtube_dl.YoutubeDL({ 
      "format": "bestaudio", 
      "postprocessors": [{
        "key": "FFmpegExtractAudio",
        "preferredcodec": "mp3",
        "preferredquality": "192",
      }]
    }).extract_info(url)

  @staticmethod
  def video(url):
    youtube_dl.YoutubeDL({ 
      "format": "bestvideo"
    }).extract_info(url)

if __name__ == "__main__":
  parser = argparse.ArgumentParser()
  config = Config()
  
  parser.add_argument('-u', '--url', required=True, help="URL for the video to download.")
  parser.add_argument('-f', '--format', required=False, default=config.format, help=f"What file format you want to download (default: {config.format}).")

  if (Config.check_config() == False):
    print("No config was found, let's create one.")
    print("In order to create a config, a couple questions will be asked.")
    location = input(f"1) Location to save downloads (default: {config.location}): ")
    format = input(f"2) Default download type (default: {config.format}): ")

    if (location != "" and location != None): config.location = location
    if (format != "" and format != None): config.format = format

    config.save_config()
  else:
    config.load_config()

  os.chdir(config.location)
  args = parser.parse_args()

  if args.format != config.format:
    format = args.format

  Download.audio(args.url)

requirements.txt

youtube_dl==2021.6.6