web3-py

Purpose

web3-py is a Python library for interacting with the Ethereum blockchain using Web3 protocols. It enables programmatic access to blockchain data, smart contracts, and transactions.

When to Use

Use this skill when building Python applications that need to query Ethereum data, deploy smart contracts, or handle transactions. Applicable for dApps, blockchain analytics, or automated scripts interacting with Ethereum nodes.

Key Capabilities

• Connect to Ethereum nodes via HTTP, WebSocket, or IPC providers.
• Manage accounts, sign transactions, and handle gas estimates.
• Interact with smart contracts using ABI definitions.
• Query blockchain state, including balances, blocks, and events.
• Support for Ethereum-compatible chains like Binance Smart Chain.

Usage Patterns

Always import web3-py and initialize a Web3 instance with a provider. Use environment variables for sensitive keys, e.g., set INFURA_API_KEY in your shell. Structure code to handle asynchronous operations with web3.async for better performance. For production, wrap calls in try-except blocks and use a reliable provider URL.