Project URL: https://github.com/ranaroussi/yfinance/pull/2023

yfinance is one of the most widely used Python libraries for accessing market data from Yahoo Finance.

In 2024, I contributed a new ~400 line analysis module that added analyst price targets, earnings and revenue estimates, earnings history, EPS trends and revisions, and growth estimates. Instead of scraping Yahoo Finance pages, the implementation uses its underlying API. The contribution was reviewed and merged upstream, and the functionality is still part of yfinance today.

The coolest part came about a year later. While building Stock Watcher with an AI coding agent, the agent independently started using functions I had added to yfinance. Seeing software casually depend on code I had contributed to such a widely used library made me ridiculously happy.