AttributeError:“Block”对象没有“send”属性

Question

我正在尝试使用python创建自己的区块链。你知道吗

我拿了this source code，我正试图调整它以适应我的需要。 我的代码：

import datetime
import hashlib


class Block:
    def __init__(
            self,
            previous_block_hash,
            data,
            timestamp,
            sender,
    ):
        self.previous_block_hash = previous_block_hash
        self.data = data
        self.timestamp = timestamp
        self.hash = self.get_hash()
        self.sender = self.get_sender()

    @staticmethod
    def create_genesis_block():
        return Block('0', '0', datetime.datetime.now(), '')

    def get_sender(self):
        self.sender = input('Enter senders ID number: ')
        return self.sender

    def get_hash(self):
        header_bin = str(self.previous_block_hash) + str(self.data) \
                     + str(self.timestamp) + str(self.sender)

        inner_hash = \
            hashlib.sha256(header_bin.encode()).hexdigest().encode()
        outer_hash = hashlib.sha256(inner_hash).hexdigest()
        return outer_hash


blockchain = [Block.create_genesis_block()]
length_of_blockchain = len(blockchain)

print ('The genesis block has been created.')
print ('Hash: %s' % blockchain[0].hash)

blockchain.append(Block(blockchain[length_of_blockchain - 1].hash,
                        'Blockchain Number: '[length_of_blockchain - 1],
                        datetime.datetime.now(), Block.get_sender()))

我想向块中添加发送方和接收方。所以，我先从一个开始，那就是发送者。我不断得到这个错误here，我不知道如何修复它。一切都在本地测试，以确保一切检查，然后我将添加反应本机到它。希望有人能帮我

Answer 1

您正在尝试在初始化self.sender之前访问它。重新排序初始化可能对我们有帮助。你知道吗

import datetime
import hashlib


class Block:
    def __init__(
            self,
            previous_block_hash,
            data,
            timestamp,
            sender,
    ):
        self.previous_block_hash = previous_block_hash
        self.data = data
        self.timestamp = timestamp

        #reordering self.hash and self.sender as self.get_sender() references to self.sender
        self.sender = self.get_sender()
        self.hash = self.get_hash()

    @staticmethod
    def create_genesis_block():
        return Block('0', '0', datetime.datetime.now(), '')

    def get_sender(self):
        self.sender = input('Enter senders ID number: ')
        return self.sender

    def get_hash(self):
        header_bin = str(self.previous_block_hash) + str(self.data) \
            + str(self.timestamp) + str(self.sender)

        inner_hash = \
            hashlib.sha256(header_bin.encode()).hexdigest().encode()
        outer_hash = hashlib.sha256(inner_hash).hexdigest()
        return outer_hash

希望这有帮助