Why did the yfinance Python library break?

And a free stock data alternative (Stooq)

Have you had issues with the Python yfinance library recently? Python stock market scripts built on yfinance have been breaking since Yahoo Finance's February 2025 website redesign that introduced new quotas and a different HTML schema for tables.

This video shows you how to swap in Stooq, a longstanding data service that offers decades of stock ticker history and delayed 5-minute and 60-minute intraday bars for free, without an API key.

This short tutorial covers the basics of Stooq for quant finance, highlights how it compares to the yfinance Python library in pulling OHLCV stock data (open, high, low, close, and volume) and demonstrates how to do a data pull in just 5 lines of code with the pandas library.

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Env Setup

pip install pandas

Full Code

import pandas as pd
from datetime import datetime, timedelta

ticker = "nvda.us"                     # Stooq wants the .us suffix for U.S. stocks
end   = datetime.today()
start = end - timedelta(days=5*365)

url = f"https://stooq.com/q/d/l/?s={ticker}&d1={start:%Y%m%d}&d2={end:%Y%m%d}&i=d"
nvda = (pd.read_csv(url, parse_dates=["Date"])
           .set_index("Date")
           .sort_index())               # chronological order
nvda

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