Solidity and 🐍Vyper hashing versions for building an address-based Merkle tree.

AddressHashing.sol

/**
 * @dev Solidity version for standard pack mode.
 */
function hashAddr(address addr) external pure returns (bytes32) {
  	/**
  	 * @dev The function `keccak256` hashes `0x000000000000000000000000+addr`.
     * Remember that one EVM word is 32 bytes and Ethereum addresses are 20 bytes long.
     */
    return keccak256(abi.encode(addr));
}

/**
 * @dev Vyper version for standard pack mode.
 */
@external
@pure
def hash_addr(addr: address) -> bytes32:
	/**
     * @dev The function `keccak256` hashes `0x000000000000000000000000+addr`.
     * Remember that one EVM word is 32 bytes and Ethereum addresses are 20 bytes long.
     */
    return keccak256(_abi_encode(addr))

----------------

/**
 * @dev Solidity version for non-standard pack mode.
 */
function hashAddr(address addr) external pure returns (bytes32) {
  	/**
     * @dev The function `keccak256` hashes `addr`.
     */
    return keccak256(abi.encodePacked(addr));
}

/**
 * @dev Vyper version for non-standard pack mode.
 */
@external
@pure
def hash_addr(addr: address) -> bytes32:
	/**
     * @dev The function `convert(addr, bytes32)` leads to `0x000000000000000000000000+addr`.
     * If you want to return `Bytes` instead, you could also use `_abi_encode`.
	 * @notice The function `slice` copies a list of bytes and returns a specified slice.
     */
    return keccak256(slice(convert(addr, bytes32), 12, 20))