code: def _attempt_to_extract_ccc(self):
          
          if len(self._national_number) == 0:
              return False
  
          country_code, number_without_ccc = _extract_country_code(self._national_number)
          if country_code == 0:
              return False
  
          self._national_number = number_without_ccc
          new_region_code = region_code_for_country_code(country_code)
          if new_region_code == REGION_CODE_FOR_NON_GEO_ENTITY:
              self._current_metadata = PhoneMetadata.metadata_for_nongeo_region(country_code)
          elif new_region_code != self._default_country:
              self._current_metadata = _get_metadata_for_region(new_region_code)
  
          self._prefix_before_national_number += str(country_code)
          self._prefix_before_national_number += _SEPARATOR_BEFORE_NATIONAL_NUMBER
          # When we have successfully extracted the IDD, the previously
          # extracted NDD should be cleared because it is no longer valid.
          self._extracted_national_prefix = U_EMPTY_STRING
          return True
docs: Extracts the country calling code from the beginning of
          _national_number to _prefix_before_national_number when they are
          available, and places the remaining input into _national_number.
  
          Returns True when a valid country calling code can be found.