text: from b_down_file import b_single_part
  from b_down_file import b_more_part
  import time
  
  
  def main():
      while True:
          print('*'*50)
          print('欢迎使用B站视频下载工具~')
          choice_list = ['单P下载输入: 1', '多P合集下载输入: 2', '退出输入: exit']
          for choice in choice_list:
              print(choice)
          print('*'*50)
          choice = input('请输入:')
          print('*'*50)
          if choice == '1':
              b_single_part.main()
          elif choice == '2':
              b_more_part.main()
          elif choice == 'exit':
              break
          else:
              print('输入错误，请重新输入...')
              time.sleep(2)
              
  
  if __name__ == '__main__':
      main()
  