Contracts

• eth_contract.Contract(contract_meta, contract_name):

This function returns a python class for the provided contract data. It will have functions for each of the defined functions in the provided contract ABI.

The Contract Class

• ContractClass(address, blockchain_client)

The python class returned from eth_contract.Contract takes an ethereum address and a blockchain client as constructor arguments. This returns an instance of your contract that can be used to interact with the contract via the provided blockchain_client

• ContractClass.get_deploy_data(*constructor_args)

This classmethod will return the hex encoded data for deploying this contract.

• ContractClass._meta.code

The compiled contract code.

• ContractClass._meta.source

The contract source code.

• ContractClass._meta.blockchain_client

The blockchain client this contract will use to interact with the blockchain.

• ContractClass._meta.abi

The contract ABI.

• ContractClass.get_balance(block="latest")

Returns contract balance in wei as an integer.

Contract Functions

For each function defined in the contract ABI there will be a callable property by the same name on the contract object. Each of these functions accepts the following additional keyword arguments in addition to the function arguments.

• value - sends the provided value in wei with the transaction.
• _from - the ethereum address that the transaction should be sent from.
• gas - specifies the gas value of the transaction.
• gas_price - the gas price for the transaction.

Functions which are denoted as constant will not send transactions when called and will return the return value of the called contract function.

Non-constant functions will send a transaction when called and will return the transaction hash of the created transaction.