def company_vat(self) -> str:
        """
        Returns Italian VAT identification number (Partita IVA).
        """
        code = self.bothify("#######") + str(self._random_vat_office()).zfill(3)
        luhn_checksum = str(calculate_luhn(int(code)))
        return f"IT{code}{luhn_checksum}"

        Returns Italian VAT identification number (Partita IVA).
        
faker/providers/company/it_IT/__init__.py