python交易记录整合交易类详解

import datetime#交易类，后期需要整合公钥，私钥class Transaction:  #payer 付款方，receiver收款方  def __init__(self,payer,receiver,money):    self.payer = payer    self.receiver = receiver    self.money = money    self.timestamp = datetime.datetime.now() #交易时间  def __repr__(self):    return str(self.payer)+" pay "+str(self.receiver)+" "+str(self.money)+" "+str(self.timestamp)if __name__=="__main__":  t = Transaction("yicheng","ddd",100)  print(t)

if __name__=="__main__":  t1 = Transaction("yicheng", "ddd1", 100)  t2 = Transaction("yicheng", "ddd2", 200)  t3 = Transaction("yicheng", "ddd3", 300)  m1 = DaDaMessage(t1)  m2 = DaDaMessage(t2)  m3 = DaDaMessage(t3)  try:    m1.seal()    m2.link(m1)    m2.seal()    m3.link(m2)    m3.seal()    #m1.hash = "0xaaaajjjjj"    #m1.data = "I　don't love "    m1.validate()    m2.validate()    m3.validate()    print(m1)    print(m2)    print(m3)  except InvalidateMessage as e:    print(e)