## Recap We learned a lot of things in this section. First, we learned how to deploy a smart contract using `Titanobo Boa`, and then how to interact with existing contracts. ### Deploying with Titano Boa We can deploy a contract with a single line of code: ```python favorites_contract = boa.load("favorites.vy") ``` This will compile, deploy, and send a transaction to a fake PyEVM chain, which is a local chain that `Titano Boa` spins up. We will not be using local chains after this section. ### Interacting with Existing Contracts To interact with an existing contract, we need the contract address and ABI. ```python MY_CONTRACT = "0xc7fE13acC3a54d7e9e704c793E8DB9F7634f80FC59" # Address # ABI favorite_deployer = boa.load_partial("favorites.vy") favorites_contract = favorite_deployer.at(MY_CONTRACT) ``` The `load_partial` method will return a deployer object, which has the ABI and `at` method. We pass the contract address to `at` to create a contract object. ### Working with Environment Variables We also learned how to store environment variables in a `.env` file. ```bash cat .env RPC_URL=http://127.0.0.1:8545 ANVIL_KEY=0xacd974bec3917e35ba4d46f2384d7f944bac47b8ded5efcae784a07f1472f2ff ``` We used the `dotenv` library to load these variables into our script. ### Code Snippets We also used some code snippets in the `deploy_favorites.py` file to set up the `RPC` and account. ```python import boa from dotenv import load_dotenv from boa.network import NetworkEnv, EthereumRPC import os from eth_account import Account load_dotenv() def main(): rpc = os.getenv("RPC_URL") env = NetworkEnv(EthereumRPC(rpc)) boa.set_env(env) anvil_key = os.getenv("ANVIL_KEY") my_account = Account.from_key(anvil_key) boa.env.add_account(my_account, force_eoa=True) favorites_contract = boa.load("favorites.vy") print("Storing a person...") favorites_contract.add_person("Alice", 25) person_data = favorites_contract.list_of_people(0) print(f"Person: {person_data}") if __name__ == "__main__": main() ``` ### Moccasin This is the last section of the `Titano Boa` series, in the next section we'll move on to the `Moccasin` series.