Get NBP currency exchange rate in python with memory cache, this can act as simple python API :)

exchange_rate.py

# license: mit
import requests
from functools import lru_cache

@lru_cache(maxsize=None)
def get_nbp_exchange_rate(date:datetime, table='A'):
    """
    Get the exchange rate from the NBP API, and store it in cache folder
    
    >> get_nbp_exchange_rate(datetime(2022,3,8))['EUR']
    4.9121
    """
    url = 'http://api.nbp.pl/api/exchangerates/tables/{:s}/{:%Y-%m-%d}/?format=json'.format(table, date)
    r = requests.get(url)
    if r.status_code != 200:
        raise RuntimeError("Unable to fetch exchange rate from NBP API")    
    return {rate['code']:rate['mid'] for rate in r.json()[0]['rates']}