[区块链]Python实现一个简单区块链(记录1)

import hashlib


# 定义区块
class Block(object):

    def __init__(self, prev_hash, data):
        self.data = data
        self.prev_hash = prev_hash

    def hash(self):
        massage = hashlib.sha256()
        massage.update(self.data.encode('utf8'))
        return massage.hexdigest()


# 创建第一个区块
def create_first_block():
    """
    生成第一个区块 - 创世区块, 没有父区块哈希
    """
    return Block('', "创世区块")


# f_block = create_first_block()
# print(f_block.hash())
# 创建区块链
class BlockChain(object):
    """
    区块链结构
    """
    def __init__(self):
        self.blocks = [create_first_block()]

    def add_block(self, data):

        last_block = self.blocks[-1].hash()
        new_block = Block(last_block, data)
        self.blocks.append(new_block)
        return new_block


block_chain = BlockChain()
b2 = block_chain.add_block("第二个区块内容")
b3 = block_chain.add_block("第三个区块内容")
b4 = block_chain.add_block("第四个区块内容")
b5 = block_chain.add_block("第五个区块内容")
b6 = block_chain.add_block("第六个区块内容")
# print(block_chain.blocks)

for i in block_chain.blocks:
    print(i.prev_hash)
    print(i.data)
    print(i.hash())
    print('\r\n')

打印结果：

创世区块
e58c2569124746d14eba0e79fcee0302ea39f93462a408bed5afd379b9084847


e58c2569124746d14eba0e79fcee0302ea39f93462a408bed5afd379b9084847
第二个区块内容
f71a6fd7df0b283ac992eca64f8c281392945d4326f692696cfe3bebbc23c99f


f71a6fd7df0b283ac992eca64f8c281392945d4326f692696cfe3bebbc23c99f
第三个区块内容
9375c4960bc255eea8b4bc8f61c1be9f3ac75cec0427ac7ec5b8daaa42e77ac8


9375c4960bc255eea8b4bc8f61c1be9f3ac75cec0427ac7ec5b8daaa42e77ac8
第四个区块内容
63382dd19f5763c9b4287aba4a32d6717944370d0f828dc2daeae5e3fc1da6cd


63382dd19f5763c9b4287aba4a32d6717944370d0f828dc2daeae5e3fc1da6cd
第五个区块内容
f653c98a556a8460b3759ce6c037efba72103f50d917cb8d811e64cb6cac5d8d


f653c98a556a8460b3759ce6c037efba72103f50d917cb8d811e64cb6cac5d8d
第六个区块内容
5a861da1d8474eaccd7a3954ea0a357243e6d89bf6b46b1d1d9d8c198ad85981