I wrote a python script to get the daily USD/CAD current exchange rate from
the Bank of Canada and output it into a .beancount file that can be include
in my main file. I need this to properly report transactions to the CRA
using the CAD value at the date of the transaction and maybe this will be
helpful to other people.
The first time you run the script, it will get all the data starting from
2021-01-01. Subsequently, it will just query for new exchange rates since
the last run and append them to the file. So if you manually edit a price,
it will no get overwritten when you the script again.
import requests, json, os.path
import datetime
priceFilename = "BofC_CADprices.beancount"
if os.path.exists(priceFilename):
priceFile = open(priceFilename, "r+")
currentPrices = priceFile.readlines()
last_line = currentPrices[-1:][0].split(' ')[0]
last_date = datetime.datetime.strptime(last_line, '%Y-%m-%d').date()
next_date = last_date + datetime.timedelta(days=1)
else:
priceFile = open(priceFilename, "w")
next_date = datetime.datetime.strptime('2021-01-01', '%Y-%m-%d').date()
end_date = datetime.date.today() - datetime.timedelta(days=1)
# Note that output format of dates should be %Y-%m-%d. Default is this, so
it
# works, but maybe should use strptime to explicity set format
url =
requests.get("https://www.bankofcanada.ca/valet/observations/FXUSDCAD/json?start_date={}&end_date={}".format(next_date,end_date))
data = json.loads(url.text)
rates = data['observations']
for r in rates:
priceFile.write('{} price USD {}
CAD;\n'.format(r['d'],r['FXUSDCAD']['v']))
priceFile.close()
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