old_contents: import os
  
  from pymongo import MongoClient
  
  from dark_keeper import DarkKeeper
  from dark_keeper.log import get_log
  from dark_keeper.menu import Menu
  from dark_keeper.request import Request
  from dark_keeper.storage import Storage
  
  export_dir = os.path.join(
      os.getcwd(), 'export', 'radio-t.com'  # path to export directory
  )
  menu = Menu(
      'https://radio-t.com/archives/',  # base url
      [
          '#blog-archives h1 a',  # css-selectors with menu links
      ],
  )
  
  mongo_client = MongoClient('localhost', 27017)
  db_name = 'podcasts'
  coll_name = os.path.basename(export_dir)
  storage = Storage(
      [
          ('title', '.hentry .entry-title'),  # col 1
          ('desc', '.hentry .entry-content'),  # col 2
          ('mp3', '.hentry audio'),  # col 3
      ],
      db_name,
      coll_name,
      mongo_client,
  )
  request = Request(
      [1, 2],  # delay
      export_dir,
      'Mozilla/5.0 (Windows NT 10.0; WOW64) '  # user-agent
      'AppleWebKit/537.36 (KHTML, like Gecko) '
      'Chrome/53.0.2785.116 Safari/537.36 OPR/40.0.2308.81',
  )
  log = get_log(
      '%(asctime)s %(message)s',  # log format
      os.path.join(export_dir, 'export.log'),  # log file
  )
  
  dk = DarkKeeper(
      menu, storage, request, log  # create DarkKeeper
  )
  dk.run()  # run process
  
new_contents: import os
  
  from pymongo import MongoClient
  
  from dark_keeper import DarkKeeper
  from dark_keeper.log import get_log
  from dark_keeper.menu import Menu
  from dark_keeper.request import Request
  from dark_keeper.storage import Storage
  
  export_dir = os.path.join(
      os.getcwd(), 'export', 'it-podcast.com'  # path to export directory
  )
  menu = Menu(
      'https://it-podcast.com/',  # base url
      [
          '.list-page .entry .title a',  # css-selectors with menu links
          '.list-page .navigation a',
      ],
  )
  
  mongo_client = MongoClient('localhost', 27017)
  db_name = 'podcasts'
  coll_name = os.path.basename(export_dir)
  storage = Storage(
      [
          ('title', '.item-page .podcast h1.title'),  # col 1
          ('desc', '.item-page .podcast .decription'),  # col 2
          ('mp3', '.item-page .podcast .mp3 a'),  # col 3
      ],
      db_name,
      coll_name,
      mongo_client,
  )
  request = Request(
      [1, 2],  # delay
      export_dir,
      'Mozilla/5.0 (Windows NT 10.0; WOW64) '  # user-agent
      'AppleWebKit/537.36 (KHTML, like Gecko) '
      'Chrome/53.0.2785.116 Safari/537.36 OPR/40.0.2308.81',
  )
  log = get_log(
      '%(asctime)s %(message)s',  # log format
      os.path.join(export_dir, 'export.log'),  # log file
  )
  
  dk = DarkKeeper(
      menu, storage, request, log  # create DarkKeeper
  )
  dk.run()  # run process
  
subject: Revert changes and add new variables