How to use the schwifty.registry function in schwifty

def _lookup_values(self, key):
        entries = registry.get("bic").get(self.compact, [])
        return sorted({entry[key] for entry in entries})

def _get_iban_spec(country_code):
    try:
        return registry.get("iban")[country_code]
    except KeyError:
        raise ValueError("Unknown country-code '{}'".format(country_code))

def exists(self):
        """bool: Indicates if the BIC is available in Schwifty's registry."""
        return bool(registry.get("bic").get(self.compact))