Python ethereum development

Here is what I did: Imported web3 library and all other required modules Initiated web3 provider by pointing to Ropsten Infura node Added an account address and private key for signing transaction. Initiated Contract instance by pointing to abi and bytecode of Truffle compiled artifacts file greeter.

Here, gas refers to the maximum amount of computation resources that a transaction should use and paid for in Ethereum. The to parameter is only required if you are sending Ether to an account or smart contract. Signed transaction with our private key and broadcasted on network. Logged transaction hash and deployed contract address in the console. So you must wait for 20 secs to get the deployed contract address. Your backend is successfully deployed on the Ethereum blockchain now.

Now you can interact with your smart contract with this address. Copy this contract address. Sending Transactions to the Deployed Contract In our contract, there is a method greet. We can add a greeting to our contract with this method alone. Open your python IDLE editor and create a new file sign. Then run py sign. To fix that we are going to run poetry add -D pytest latest in your terminal. This will install the latest pytest version. Once this command finishes running you should be able to see the change that happened in your pyproject.

Next, let's add brownie as a dependency in our project. You can do this by running poetry add eth-brownie in your terminal. This should run nicely. Next, let's add vyper as a dependency. As you can guess, you can do that with a poetry add vyper command. Here, there might be a catch with versions. If not you are lucky, otherwise here is what it might look like. That tells poetry to add a specific version of vyper to your project that eth-brownie package likes.

Testing the environment Now that we did all the groundwork, let's test if all the installations are working nicely with each other. Try running poetry run brownie console in your terminal. If the console doesn't throw any error at you and you can actually see something that looks like a Python interpreter, then good job, we can move to the next steps! If you are running into some issue make sure to DM me on Twitter , I'll help you debug your issues.

The reason we are running commands with poetry run before them is that this way we are telling our console to run using poetry. This way poetry will create a virtual environment for us and we don't have to think about these things anymore. Try playing around with the console. Type accounts and press Enter. This should display the 10 wallet addresses that brownie created for us in the test network. To see other things you can do in brownie console, check out their docs they are excellent.

Setting up the Wallet and Network Connection To create a token on one of the Ethereum networks we will have to connect to those networks. For that we will need two things: a wallet like metamask an infura account A wallet will hold your token and will be used to make any transactions. An Infura account is required to actually connect to the Ethereum network.

You could try doing it yourself, for that you would need to get the whole Ethereum ledger among other things. This is a hassle, so I recommend going with Infura, they make it very easy, and free, especially if you are just playing around with it. They only start charging after more than k operations have been made with your Id.

Infura Go to the Infura's website and create an account there. Once registered go to the Ethereum tab and "Create a New Project". Then go to the setting tab under your project and see if a "client id" and a "project secret" have been generated. If so, then we are all good on the Infura front. One last config you have to do is to enable the Polygon Network on your Infura account.

To do that, head over to the payments page , click on the Polygon PoS option, and Update Subscription. Wallet For the wallet requirement, we are going to use Metamask. Go to the link above and install the browser extension. Follow the steps to create your first wallet. If you already have a wallet, I suggest you create a new one, just for testing this tutorial.

That way we minimize any chance of leaking secret info. Although this tutorial has this covered. Then you need to add Polygon mainnet and testnet to your metamask wallet. To do that please follow this tutorial. One last final thing. If either option is not working try the following link. Environment Variable It is never a good idea to keep your secrets directly in the code.

Instead, we need to use the environment variable. Here is how to do it well. Copy that over to the. To get it, you should click on your Metamask extension and press the three dots on the top right corner. Once you clicked the Account Details button, the next button to click will be the Export Private Key. Copy the key over to the. Finally, the final step to making this super secure is to make sure git doesn't track and therefore doesn't expose that file.

In order to do that, create a file called. This is what I have in my. For that add a new dependency to our project by running poetry add python-dotenv in your terminal. Note: if you ever run into an issue with dependency versioning like below try installing the exact version that is "requested". This is because eth-brownie is somewhat strict on versions it uses for some packages. So in this example, I would do poetry add python-dotenv 0. We can do that by modifying the brownie-config.

We don't yet have that in our repo. So, go ahead and create that file in the root folder of your project. Then add the following line to it: dotenv:. Deploying your Token Now that we are done with the set up we can get to the actual Token creation. Creating a Local Account When we first played around with the Brownie console you saw that 10 accounts were created.

None of these were "our" accounts. Since a minted token will need to be created from an account we need to create one. So, to create an account on our local machine you are going to run this command: poetry run brownie accounts new test-account Note that you can use any name that you want instead of test-account. You can give it the name of your token like I did razzle-dazzle-account.

You will be asked for your Private Key and Your Password. For the Private Key you can use the value that you saved in the. For the Password you can use your Metamask password. Note: You can actually use other values for that command, something that you come up with. But to keep it simple, I thought it makes sense to use the same values. Preparing the deployment file In the scripts folder create a token. Then add the following to that file:! You can enter anything you want here.

This is mostly a standard, so I suggest you keep this value. This is the same as You can enter any amount you want. We should be ready to deploy our token!!!. Deploying our Token Well, we are almost done. First, we will deploy to the test network. To do that use the following command in your terminal : poetry run brownie run token. Use the password you used in the account creation stage. If everything goes well, you should see something like this: Brownie v1.

Enter password for "hello": Transaction sent: 0xb92fa73bdb55b7c9db7bd15db69d2ee2ff24a7f9eeb5d Gas price: 3. We can move on to the mainnet network. If it didn't work, you need to look at the error output, it will suggest what you need to do. Let's deploy to the mainnet now to make it more "real". All you have to do is replace the network flag, like so: poetry run brownie run token. Seeing you Tokens in your wallet The last thing to check if everything worked is to check if the tokens are in your wallet.

To do that we can head over to the Metamask extension and import the token. Copy the location where the token was deployed to. It is the last value you get in the output, after running the token. In the Metamask extension, go to the Assets tab and press the Import Token button.

Press Add Custom Token You should now see the token in your wallet and can do anything you want.

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