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本文由 威-kaifa873 整理发布，仅作为项目开发需求参考！飞机@sleu88

　There are many situations where smart contracts can be applied,and many companies have already done so.For example,Slock.it helps its users automatically share,pay and rent through smart contracts.Fizzy AXA uses blockchain automation flight insurance compensation.Populous uses smart contracts and many other ways to alleviate the problem of purchasing and selling open invoices.

　　#Open Auction

　　#Auction params

　　#Beneficiary receives money from the highest bidder

　　beneficiary:public(address)

　　auctionStart:public(uint256)

　　auctionEnd:public(uint256)

　　#Current state of auction

　　highestBidder:public(address)

　　highestBid:public(uint256)

　　#Set to true at the end,disallows any change

　　ended:public(bool)

　　#Keep track of refunded bids so we can follow the withdraw pattern

　　pendingReturns:public(HashMap[address,uint256])

　　 external

　　def __init__(_beneficiary:address,_bidding_time:uint256):

　　self.beneficiary=_beneficiary

　　self.auctionStart=block.timestamp

　　self.auctionEnd=self.auctionStart+_bidding_time

　　#Bid on the auction with the value sent

　　#together with this transaction.

　　#The value will only be refunded if the

　　#auction is not won.

　　 external

　　 payable

　　def bid():

　　#Check if bidding period is over.

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