Python web3 development 1 how to make dapps with python
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python web3 development: building decentralized applications (dapps)
in this tutorial, we will explore how to build decentralized applications (dapps) using python and the `web3.py` library. dapps interact with blockchain networks like ethereum, enabling you to create applications that can manage smart contracts, interact with wallets, and perform various blockchain-related tasks.
prerequisites
before we start, ensure you have the following:
python 3.x installed on your machine.
basic knowledge of python programming.
familiarity with blockchain concepts, particularly ethereum.
an ethereum node or a provider like infura or alchemy.
step 1: setting up your environment
1. *install `web3.py`:*
you can install the `web3.py` library using pip:
2. *create a project directory:*
create a new directory for your project:
step 2: setting up a connection to ethereum
you can connect to an ethereum node using infura, alchemy, or a local node (like ganache). here, we'll use infura.
1. *sign up for infura:*
go to [infura's website](https://infura.io/) and create an account. create a new project and note the project id (this will be used as the endpoint).
2. *connect to the ethereum network:*
create a file named `app.py` in your project directory and add the following code:
replace `your_infura_project_id` with your actual infura project id.
step 3: interacting with smart contracts
let's say you want to interact with a simple erc20 token smart contract to check the balance of an address.
1. *find a token contract:*
for this example, we’ll use the dai token contract, which is a widely used erc20 token. the dai contract address on ethereum mainnet is: `0x6b175474e89094c44da98b954eedeac495271d0f`.
2. *create a contract instance:*
add the following code to `app.py` to interact with the dai token contract:
replace `your_ethereum_address` with the ethereum address you want to check the ...
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