def __init__(self, name, events_pool, settings={}):
super(SimpleBlotter, self).__init__(name)
self.open_orders = set()
self.positions = {} # Contract: Position
self.holding = {} # 当前的资金 dict
self.api = SimulateTraderAPI(self, events_pool) # 模拟交易接口
self._all_orders = []
self._pre_settlement = 0 # 昨日结算价
self._datetime = None # 当前时间
self._all_holdings = [] # 所有时间点上的资金 list of dict
self._all_transactions = []
self._capital = settings['capital']
