Alpaca-py is the official Python SDK launched by Alpaca, offering a versatile and developer-friendly interface for building trading apps, streaming real-time crypto and stock market data, and interacting with Alpaca's complete suite of APIs. With its simplicity and versatility, Python is one of today's most popular programming languages, making it an ideal choice for developers to create their own investment apps on Alpaca. The SDK has been upgraded from the previous alpaca-trade-api, featuring an idiomatic Python codebase, well-documented models, and simplified submission of large object payloads. It allows users to trade, place orders, access historical data, stream live market data, and manage thousands of brokerage accounts with detailed documentation. To use Alpaca-py, developers need to sign up for Alpaca's Trading API or Broker API account, retrieve their API keys, and install the SDK using pip on Python 3.7+.