beanprice: Price quotes fetcher for Beancount

Description

A script to fetch market data prices from various sources on the internet and render them for plain text accounting price syntax (and Beancount).

This used to be located within Beancount itself (at v2) under beancount.prices. This repo will contain all future updates to that script and to those price sources.

Documentation

Some documentation is still part of Beancount. More about how to use this can be found on that mailing-list. Otherwise read the source.

Quick start

To install beanprice, run:

pip install git+https://github.com/beancount/beanprice.git

You can fetch the latest price of a stock by running:

bean-price -e 'USD:yahoo/AAPL'

To fetch the latest prices from your beancount file, first ensure that commodities have price metadata, e.g.

2000-01-01 commodity AAPL
  price: "USD:yahoo/AAPL"

Then run:

bean-price ledger.beancount

To update prices up to the present day, run:

bean-price --update ledger.beancount

For more detailed guide for price fetching, read https://beancount.github.io/docs/fetching_prices_in_beancount.html.

Price source info

The following price sources are available:

More price sources can be found at awesome-beancount.com website.

Creating a custom price source

To create a price source, create a package (i.e. my_package) with a module (i.e. my_module) that contains the Source class which inherits from the beanprice.Source class:

from beanprice import source

class Source(source.Source):
  def get_latest_price(self, ticker) -> source.SourcePrice | None:
    pass
  
  def get_historical_price(self, ticker, time):
    pass

Implement the logic for fetching the prices. At a minimum, the get_latest_price() is required.

Then use your price source in the commodities

1900-01-01 commodity XYZ
  price: "AUD:my_package.my_module/XYZ"

AUD just being an example of a currency specification.

Testing

Run tests:

pytest beanprice

Lint:

pylint beanprice

Type checker:

mypy beanprice

Copyright and License

Copyright (C) 2007-2020 Martin Blais. All Rights Reserved.

This code is distributed under the terms of the "GNU GPLv2 only". See COPYING file for details.