mastercardConvert.py

#!/usr/bin/env python

import argparse
import logging
from functools import partial

from domain import date, transaction

# Parse command line arguments
parser = argparse.ArgumentParser(description="Convert currency using MasterCard exchange rates",
                                 epilog='If no date is specified, the most recent date with rates is used.')
parser.add_argument('from_quantity', type=float, help='Quantity of from_currency used in transaction')
parser.add_argument('from_currency', type=str.upper,
                    help='The currency to convert from, i.e. the transaction currency, e.g. GBP, USD, JPY')
parser.add_argument('to_currency', type=str.upper,
                    help='The currency to convert to, i.e. the card currency, e.g. GBP, USD, JPY')
parser.add_argument('-d', '--date',
                    help='Day the exchange was made in format YYYY-MM-DD. Only today and yesterday appear to be supported by MasterCard. Defaults to most recent day with rates.')
parser.add_argument('--log_level', help='Set logging level', default='WARNING',
                    type=str.upper,
                    choices=['CRITICAL', 'ERROR', 'WARNING', 'INFO', 'DEBUG'])
parser.add_argument('-t', '--today', action='store_true',
                    help='Use today\'s exchange rates. This may error if today\'s rates have not been uploaded')
parser.add_argument('-y', '--yesterday', action='count', default=0,
                    help='Uses yesterday\'s exchange rates. Repeat to go further back in time')
args = parser.parse_args()

logging.basicConfig(level=logging.getLevelName(args.log_level))
logging.debug(args)

# Figure out which date to use
if args.date is not None:  # User-specified date
    settle = partial(transaction.settle, exchange_rate_date=date.parse(args.date))
elif args.today:  # Today
    settle = partial(transaction.settle, exchange_rate_date=date.date_today())
elif args.yesterday > 0:  # Yesterday (note that yesterday can be specified multiple times)
    settle = partial(transaction.settle, exchange_rate_date=date.date_n_days_ago(args.yesterday))
else:  # Use most recent date with published rates, discover date from initial MasterCard call
    settle = transaction.settle_latest

# Get card amount from MasterCard
transaction = settle(
    transaction_amount=args.from_quantity,
    transaction_currency=args.from_currency,
    card_currency=args.to_currency,
)

# Output conversion
print(transaction['card_amount'])