import random


#主类
class Timer:
    def __init__(self):
        self.time = 0

    def update(self):
        self.time += 1


#交易中心
class TradeCenter:
    def __init__(self):
        #定义当前价格
        self.price = random.uniform(1,100)#当前股价
        self.total = 100000#共有多少股
        self.majorNum = 100000#当前系统持有股
        self.majorNumOld = 100000#前一天系统持有多少股

    def update(self):
        #更新价格
        a = random.uniform(-1,1) + (self.majorNum - self.majorNumOld)/self.total
        if abs(a)<=0.2*a:
            self.price = self.price + a
        elif a>0:
            self.price = self.price*1.2
        else:
            self.price = self.price*0.8
        #存储前一天持有股
        self.majorNumOld = self.majorNum
    
    def buy(a,self):
        self.majorNum += a

    def sell(a,self):
        self.majorNum -= a

class Person:
    def __init__(self):
        self.money = 100#可用金额
        self.Num = 0#持有股数
    def buy(a,TradeCenter,self):
        self.money -= a*TradeCenter.price
        self.Num += a
        TradeCenter.sell(a)
    def sell(a,TradeCenter,self):
        self.money += a*TradeCenter.price
        self.Num -= a
        TradeCenter.buy(a)