consume ticks

def tickUpdate(self, tick_dict):
        ''' consume ticks '''
        assert self.symbols
        assert self.symbols[0] in tick_dict.keys()
        symbol=self.symbols[0]
        tick=tick_dict[symbol]

        if self.increase_and_check_counter():
            self.place_order(Order(account=self.account,
                                  action=Action.BUY,
                                  is_market=True,
                                  symbol=symbol,
                                  price=tick.close,
                                  share=self.per_amount / float(tick.close)))