Learn WEB3PY with Real Code Examples

Send ETH or ERC20 token transaction

Read smart contract state

Subscribe to events for DeFi protocols

Automate NFT minting script

Fetch historical transaction logs

Check node connectivity

Verify correct ABI and contract address

Ensure account has sufficient funds

Handle gas estimation errors

Monitor RPC rate limits and timeouts

Run local Ganache node for testing

Deploy contracts on testnet

Use pytest for script automation tests

Simulate transactions before sending to mainnet

Monitor logs for correct event emission

Local development node (Ganache/Hardhat)

Testnet deployment (Goerli, Sepolia)

Mainnet deployment via Web3.py scripts

CI/CD integration for automated deployment

Environment-specific configuration management

Web3.py

Infura or Alchemy node providers

Ganache or Hardhat local node

Python testing frameworks (pytest)

eth-account and eth-utils libraries

Ethereum mainnet and testnets

EVM-compatible chains (Polygon, BSC, Avalanche)

Python backend apps

DeFi bots and analytics scripts

NFT marketplaces backend

Use virtual environments for dependency management

Store secrets in environment variables

Test scripts on local or testnet nodes

Use async Web3 providers for efficiency

Document scripts and workflows clearly

Handling RPC node failures

Gas management and transaction errors

Understanding contract ABI structure

Async handling for event polling

Debugging blockchain network issues