Beanprice custom source

[Thomas den Hollander]

Hello everyone,

I wanted to write custom sources for bean-price, but I'm unsure what the best way to do this is. I'm not very experienced with Python or its module system. Say I have a folder with my own sources, how do I reference these while fetching the price? Should I add the path to my PYTHONPATH? Or maybe install it as a module?

- Thomas

[Martin Blais]

You can reference them by the name of their Python module if they're outside the library.

You can use the short name if they're in the library, here:

https://github.com/beancount/beanprice/tree/master/beanprice/sources

New ones are welcome. Minimal requirement for inclusion in the library is a unit test covering basic usage and mocked, that is, not connecting to the network.

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[Thomas den Hollander]

Thanks! My price source is pretty specific, but I'll probably publish it at some point.

Op zondag 11 april 2021 om 15:34:51 UTC+2 schreef bl...@furius.ca:

[Thomas den Hollander]

One more question. Many price sources are only available in USD while my main currency is EUR. How do I deal with that? Is Fava able to display the total worth by converting via USD to EUR? Should I convert these price statements myself, and if so, would it be useful to have such functionality in bean-price?

Op zondag 11 april 2021 om 17:39:18 UTC+2 schreef Thomas den Hollander:

[Martin Blais]

Fava is a completely different question and AFAIK it should respect Beancount's notion of "operating currency", which is configurable.

For Beanprice, the sources may return their quote currency, here:

https://github.com/beancount/beanprice/blob/master/beanprice/source.py#L31

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[Patrick Ruckstuhl]

What I'm using is to calculate cross rates on the flying using a plugin:

So if you have e.g. a stock price in USD and the fx rate between EUR and USD, it calculates the stock price in EUR

https://github.com/tarioch/beancounttools/blob/master/src/tariochbctools/plugins/generate_base_ccy_prices.py

Regards,

Patrick

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[Thomas den Hollander]

Computing prices on the fly is nice. However, using it with bean-price doesn't seem ideal. For example, the required USD/EUR prices are not fetched by --update if I don't have any USD myself.

Would it be a good idea to have some sort of pipe syntax for bean-price? Something like EUR:(source1/ticker1>source2/ticker2) that would first fetch the price of ticker1 and then convert the currency base using ticker2? It can just be a chain of multiplication since '^' would take care of divisions.

Op zondag 11 april 2021 om 20:30:59 UTC+2 schreef pat...@ch.tario.org:

[Thomas den Hollander]

Actually, this can be implemented as another price source with the piped sources in place of its ticker symbol. That way, no code changes are required for bean-price itself.

Op maandag 12 april 2021 om 14:06:01 UTC+2 schreef Thomas den Hollander: