{
  'server': {
    'level': 'DEBUG',
    // option: CRITICAL   ERROR   WARNING   INFO   DEBUG
    'date_fmt': '%Y-%m-%d %H-%M-%S'
    // format at https://docs.python.org/zh-cn/3.8/library/time.html#time.strftime
  },
  'client': {
    'level': 'DEBUG',
    // option: CRITICAL   ERROR   WARNING   INFO   DEBUG
    'date_fmt': '%Y-%m-%d %H-%M-%S'
    // format at https://docs.python.org/zh-cn/3.8/library/time.html#time.strftime
  },
  'file': {
    'level': 'DEBUG',
    // option: CRITICAL   ERROR   WARNING   INFO   DEBUG
    'filename': {
      'main': '{date} SR.log',
      // {date} -> date
      '{date}': '%Y-%m-%d %H-%M-%S'
      // format at https://docs.python.org/zh-cn/3.8/library/time.html#time.strftime
      // can and more {xx} by adding more obj  EZ
    }
  }
}