What is the exception?

[Yoriz]

Note: you forgot to make an instance of CurrencyRates

Looking at the Github source
The get_rate method raises
RatesNotAvailableError
See

• raise RatesNotAvailableError("Currency Rate {0} => {1} not available for Date {2}".format( base_cur, dest_cur, date_str))
  
• raise RatesNotAvailableError("Currency Rates Source Not Ready")
  

try:
    res = currency_rates.get_rate('USD', country, date)
except RatesNotAvailableError as error:
    print(f"Error raised: {error}"

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You will be stuck in an infinite loop success is never altered from False

while success == False: