py-evm

import os from eth import constants from eth.chains.mainnet import MainnetChain from eth.db.atomic import AtomicDB from eth_utils import to_wei, encode_hex from eth_typing import Address def run_evm_example(): # Setup a mock address and initial balance MOCK_ADDRESS = Address(b'\x00' * 19 + b'\x01') # An arbitrary address PREFUND_AMOUNT = to_wei(100, 'ether') # Initialize a new chain with an atomic database # AtomicDB is an in-memory database suitable for tests and examples chain = MainnetChain.from_genesis( AtomicDB(), genesis_state={ MOCK_ADDRESS: { 'balance': PREFUND_AMOUNT, 'nonce': 0, 'code': b'', 'storage': {} } }, genesis_header_params={ 'gas_limit': constants.GAS_LIMIT, 'difficulty': 1 # Simplified difficulty for non-PoW chain } ) # Get the current VM from the chain vm = chain.get_vm() print(f"Chain created successfully. Current block number: {vm.get_block().header.block_number}") print(f"Balance of {encode_hex(MOCK_ADDRESS)}: {vm.get_balance(MOCK_ADDRESS)} Wei") # Example: Accessing a constant print(f"Default transaction gas limit: {constants.GAS_LIMIT}") if __name__ == "__main__": run_evm_example()