如何在python中以太坊区块链上创建合约？

Question

I want to create contract on Ethereum to store data. I'm beginner on this domain...Do we have a better solution ?

In this post , someone tell me to download a plugin. This is one way to do it, but I want to insert data in a block-chain with python (or other language).

I don't know where to start ... download Ethereum? Create an account?

Does it incur any cost? How much?

If contracts can be update, can I use Ethereum contract to prove work?

Answer 1

I don't know where to start ... download Ethereum? Create an account?

1. Install the command line tools. ethereum.org/cli

   I would not recommend to start with the pyethapp (Python) or the eth (C++) client. Use geth (Golang) or parity (Rust). They are good to get started with and well documented.

2. Create a hello world contract. ethereum.org/greeter

   greeter is the most simple smart contract deployed using the command line.

    contract mortal { /* Define variable owner of the type address*/ address owner; /* this function is executed at initialization and sets the owner of the contract */ function mortal() { owner = msg.sender; } /* Function to recover the funds on the contract */ function kill() { if (msg.sender == owner) selfdestruct(owner); } } contract greeter is mortal { /* define variable greeting of the type string */ string greeting; /* this runs when the contract is executed */ function greeter(string _greeting) public { greeting = _greeting; } /* main function */ function greet() constant returns (string) { return greeting; } } 

3. Come back here if you have specific issues with a client, with a contract source code or with deploying them on the blockchain.

Hope that helps getting you bootstrapped :)

Answer 2

You may also use (py)ethereum and serpent - in order to keep the python spirit - If it is ok for you, you may take a look at " A Programmer's Guide to Ethereum and Serpent ". Regards