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Development & Code
yahoofinancials
yahoofinancials logo
Development & Code

yahoofinancials

yahoofinancials is a Python library designed to retrieve historical stock price data, fundamental financial data, and technical indicators from Yahoo Finance. It serves developers, data scientists, and financial analysts who need programmatic access to financial market data for analysis, backtesting trading strategies, building financial dashboards, or conducting academic research. The library abstracts the complexities of web scraping and API interactions with Yahoo Finance, providing a clean, object-oriented interface. It allows users to fetch data for single or multiple tickers across various global exchanges, supporting daily, weekly, and monthly intervals. Key functionalities include retrieving income statements, balance sheets, cash flow statements, and key statistics like P/E ratios and market capitalization. While Yahoo Finance itself is a free data source, this library simplifies access, though users should be aware of potential rate limits and data accuracy disclaimers from the source. It is positioned as a convenient, open-source alternative for those who do not require the real-time, high-frequency data provided by premium financial data vendors.

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📊 At a Glance

Pricing
Free
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Development & Code
Python IDEs

Key Features

Historical Price Data Retrieval

Fetches open, high, low, close, adjusted close prices, and volume for stocks over user-defined date ranges and intervals (daily, weekly, monthly).

Fundamental Financial Statements

Retrieves annual and quarterly income statements, balance sheets, and cash flow statements directly from Yahoo Finance.

Key Statistics and Summary Data

Accesses a wide array of key metrics such as market capitalization, P/E ratio, dividend yield, beta, and 52-week high/low.

Multi-Ticker Batch Operations

Allows instantiation of the class with a list of ticker symbols to fetch data for multiple securities in a single object.

Technical Indicators Calculation

Provides methods to fetch pre-calculated technical indicators like moving averages, RSI, and Bollinger Bands based on historical price data.

Global Exchange Support

Supports tickers from major global exchanges (e.g., NYSE, NASDAQ, LSE, TSE) by using the appropriate ticker symbol format.

Pricing

Free / Open Source

$0
  • ✓Full access to all library methods for historical price data, financial statements, and technical indicators.
  • ✓Support for multiple tickers and global exchanges.
  • ✓Ability to specify custom date ranges and intervals (daily, weekly, monthly).
  • ✓Access to the source code for customization and contribution on GitHub.
  • ✓Community support via GitHub Issues; no official SLAs or guaranteed support.

Use Cases

1

Quantitative Trading Strategy Backtesting

A quantitative analyst uses yahoofinancials to download years of historical price data for a universe of stocks. They feed this data into their own Python backtesting framework to evaluate the performance of algorithmic trading strategies based on moving average crossovers or momentum indicators. The library's batch data fetching speeds up the data acquisition phase, allowing for rapid iteration on strategy parameters.

2

Academic Financial Research

A university researcher employs the library to collect financial statement data (income, balance sheet) for all S&P 500 companies over a decade. They use this dataset to study the relationship between corporate leverage and profitability, or to test asset pricing models. The structured JSON output facilitates easy conversion to pandas DataFrames for statistical analysis and visualization in tools like Jupyter notebooks.

3

Personal Investment Dashboard Development

An individual investor and Python hobbyist builds a personal web dashboard using Flask or Streamlit. They integrate yahoofinancials to pull real-time key statistics and historical charts for their watchlist. The dashboard automatically updates portfolio metrics and visualizes performance, replacing manual checks on financial websites and providing a customized view of their investments.

4

Financial Data Pipeline for Startups

A fintech startup with a limited budget uses yahoofinancials as an initial data source to power its MVP application, which offers basic stock screening or educational content. They schedule daily scripts to fetch updated price and fundamental data, storing it in their database. This allows them to validate their product concept without the high cost of premium market data feeds in the early stages.

5

Educational Tool for Finance Students

An instructor creates interactive Python assignments where students use yahoofinancials to analyze company performance. Students might compare the valuation ratios of tech giants or reconstruct a discounted cash flow model using historical cash flow data. The hands-on experience with a programming library bridges the gap between theoretical finance and practical data analysis skills.

How to Use

  1. Step 1: Install the library using pip by running the command 'pip install yahoofinancials' in your terminal or adding it to your project's requirements.txt file.
  2. Step 2: Import the YahooFinancials class into your Python script or Jupyter notebook with 'from yahoofinancials import YahooFinancials'.
  3. Step 3: Instantiate the class by creating an object for a single ticker (e.g., 'apple = YahooFinancials("AAPL")') or a list of tickers (e.g., 'stocks = YahooFinancials(["AAPL", "MSFT", "GOOG"])').
  4. Step 4: Call the desired methods on the object to fetch data, such as 'apple.get_historical_price_data("2020-01-01", "2020-12-31", "daily")' for historical prices or 'apple.get_financial_stmts("annual", "income")' for financial statements.
  5. Step 5: Process the returned data, which is typically in JSON format, using Python's json module or pandas DataFrame for further analysis, visualization, or storage.
  6. Step 6: For advanced use, utilize methods like 'get_stock_quote_type_data()' for basic info, 'get_summary_data()' for key statistics, or 'get_technical_indicators()' for indicators like moving averages.
  7. Step 7: Handle potential errors and rate limits by implementing try-except blocks and considering adding delays between requests if fetching large batches of data.
  8. Step 8: Integrate the data fetching into automated scripts, financial models, or web applications, scheduling regular updates using task schedulers like cron or Celery for recurring analysis.

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At a Glance

Pricing Model
Free
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