new_contents: """
  Event type string used in VN Trader.
  """
  
  from vnpy.event import EVENT_TIMER
  
  EVENT_TICK = 'eTick.'
  EVENT_TRADE = 'eTrade.'
  EVENT_ORDER = 'eOrder.'
  EVENT_POSITION = 'ePosition.'
  EVENT_ACCOUNT = 'eAccount.'
  EVENT_CONTRACT = 'eContract.'
  EVENT_LOG = 'eLog'
  
subject: Add trader event type definition