Python无ABI文件打包EVM合约方法名及参数方法

# pip install eth-abi
import eth_abi

# pip install safe-pysha3
from sha3 import keccak_256

def keccak_256_hash(data: str) -> bytes:
	k = keccak_256()
	k.update(data.encode())
	return k.digest()

def get_method_id(method_sig: str) -> bytes:
    return  keccak_256_hash(method_sig)[:4]

def pack_abi_data(method: str = None, params: list = None) -> bytes:
	"""
    打包evm合约方法及参数
    :param method: 合约方法，打包合约初始化参数时method=None
    :param params: 合约参数，例如[("uint256": 10000),("address", "0xa166c92f4c8118905ad984919dc683a7bdb295c1")]
    :return: 打包后的数据
    """
	params_data = b''
	types, values = [], []
	if params:
		for param_type, param_value in params:
			types.append(param_type)
			values.append(param_value)
		params_data = eth_abi.encode(tuple(types), tuple(values))

	if method:
		method_sig = f"{method}({','.join(types)})"
		method_id = get_method_id(method_sig)
		return b'%s%s' % (method_id, params_data)
	return params_data

使用示例

data =  pack_abi_data("updateBalance", params=[
    ("uint256", 10000), 
	("address", "0xa166c92f4c8118905ad984919dc683a7bdb295c1")])
print(data.hex())