yfinance
A structured Python interface for retrieving and validating market data using yfinance.
Implements the DataSource protocol from pydantic-market-data to provide type-safe security resolution and historical data fetching.
Features
- Protocol-Oriented: Implements
DataSourceinterface. - Security Resolution: Resolve ISINs and Symbols to valid
yfinancetickers. - Validation:
- Price Validation: Verify tickers against daily high/low range.
- Date Validation: Validate prices on specific historical dates.
- CLI: Optional command-line interface for lookup and history.
Installation
uv pip install py-yfinance
Usage
As a Library
from py_yfinance import YFinanceDataSource
from pydantic_market_data.models import PriceOnDate, SecurityQuery
source = YFinanceDataSource()
# 1. Simple lookup by symbol
result = source.resolve(SecurityQuery(symbol="AAPL"))
print(result.symbol, result.price)
# 2. Strict validation by date and price
# Useful for verifying ISIN mappings or ensuring data quality
query = SecurityQuery(
isin="NL0010273215",
price_on=PriceOnDate(date="2025-12-15", price=923.4),
)
match = source.resolve(query)
if match:
print(f"Verified: {match.symbol}")
else:
print("Validation failed: price mismatch or symbol not found")
Dates accept YYYY-MM-DD, YYYY/MM/DD or YYYYMMDD; any other string raises ValidationError.
CLI Usage
Lookup
Resolve a security by symbol or ISIN.
# Basic lookup
uv run yfinance lookup --symbol AAPL
# ISIN lookup with strict validation
# Verifies that NL0010273215 traded near 923.4 on 2025-12-15
uv run yfinance lookup --isin NL0010273215 --date 2025-12-15 --price 923.4
History
Fetch daily candles.
uv run yfinance history --symbol AAPL --period 5d
Search
uv run yfinance search tesla
Output is a JSON envelope when stdout is not a terminal; pass --format plain for text. Run uv run yfinance <command> --schema for a command's input and output schema.
Development
This project uses uv for dependency management.
# Sync dependencies
uv sync
# Run Tests
uv run pytest
License
MIT
1 maintainer
Metadata
1 maintainer
Release files for py-yfinance 0.4.0
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