def main():
    amountAll = 0                                              #持有总量
    cost = 0                                                   #成本
    marketValueCurrent = 0                                     #当前持有总市值
    marketValueExpected = 0                                    #当前期望总市值
    rateOfReturn = 0                                           #收益率
    eachBuy = 100
    while True:
        marketValueExpected = marketValueExpected + eachBuy        #计算当前期望总市值
        ticker = exchange.GetTicker()
        price = ticker['Last']                                 #获得当前价格