Tokens are not new things; we've already been using their similar forms daily, for example, fiat currency, ID cards, casino chips, stock certificates, and so on and so forth. In Web 3.0, tokens are basically divided into fungible tokens and non-fungible tokens (NFTs), which are the atomic unit of Web3. And ERC20, or Ethereum Request for Comment 20, is the implemented standard for fungible tokens created using the Ethereum blockchain.

In this article, I would go through how to build your own Web3 fungible token (ERC20) using Python, brownie, solidity, and Openzepplin. By the end of this article, you can learn a basic flow to build it and start tokenizing your things.

Ingredients on Web3 Fungible Token – Build an ERC20 Token Using Python, Brownie, and Solidity

Python, brownie, solidity, Openzepplin

Table of Contents on Web3 Fungible Token

• Openzepplin & Name your unique Token
• Deployment scripts using Python
• Brownie-config and .env
• Add the token to your main network
• Fungible token ERC20 Playbook
• FAQ

Openzepplin & Name your Unique Token

First thing first, building a token also starts from the smart contract and its constructor code writing. Nevertheless, it has quite a lot of open-source code out there. This article would use OpenZeppelin. Please go to Openzeppelin documentation and open the token ERC20 section and copy these codes as follows to your script:

// contracts/ourToken.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
contract ourToken is ERC20 {
 constructor(uint256 initialSupply) ERC20("ourToken", "louisToken") {
 _mint(msg.sender, initialSupply);
 }
}

Please be sure to modify the name, which separately is the contract name and your token name

ourToken
louisToken

Then, the next step is just compiling using brownie and it’s done!

Deployment Scripts Using Python

After having compiled the smart contract, it’s time to create the deployment script using Python. Basically, it’s the same as our previous projects, which used the Web3 module and the smart contract to deploy the specific account.

from brownie import ourToken
from scripts.assistant import get_account
from web3 import Web3
initial_supply = Web3.toWei(1000, "ether")
def main():
 account = get_account()
 our_token = ourToken.deploy(initial_supply, {"from": account})
 print(our_token.name())

Brownie-config and .env setting

As we are using the Openzepplin smart contract modules, it's necessary to map the module scripts in brownie-config.yaml as well as we did in other projects. Below is the 4.8.0 version we used at the moment.

dependencies:
- OpenZeppelin/openzeppelin-contracts@4.8.0
compiler:
 solc:
 remappings:
 - '@openzeppelin=OpenZeppelin/openzeppelin-contracts@4.8.0'

For grabbing the up-to-date version, please go to google Openzepplin contract GitHub and use the latest version.

Regarding the wallet, network, and .env setting in YAML, basically, they are all same as settings in other Web3 projects we walked through before. Thus, please refer to other articles in the Easy2Digital Web3 collection. Here are two for your references

Use Infura and MetaMask in Python Scripts to Deploy Web3 Smart Contracts on a Real Ethereum BlockChain Network

Brownie FundMe Smart Contract Deployed on Ethereum Using Python & Web3

Add the Token on the main network (Test one in this article)

Once all settings are done, we can run the script with the selected network and proceed to deploy it on the live blockchain network.

Command:

Brownie run scripts/deploy_token.py –network goerli

The transaction is transparent so we can go to Etherscan to check the record.

Then, for adding your owned fungible token to your wallet, please add the token deployed address to your wallet, for example, MetaMask. Here is the step sample:

Your token name would automatically be detected and popped up in the window after having input the address

Fungible Token ERC20 Playbook

• If you are interested in learning more about fungible tokens, please subscribe to our Youtube Channel and comment “erc20” in the following video (Fungible Token Playbook)
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