def _is_leading_zero_possible(country_code):
 region_code = region_code_for_country_code(country_code)
 metadata = PhoneMetadata.metadata_for_region_or_calling_code(country_code, region_code)
 if (metadata is None):
  return False
 return metadata.leading_zero_possible

def _is_leading_zero_possible ( country_code ) : region_code = region_code_for_country_code ( country_code ) metadata = PhoneMetadata . metadata_for_region_or_calling_code ( country_code , region_code ) if ( metadata is None ) : return False return metadata . leading_zero_possible
checks whether the country calling code is from a region whose national significant number could contain a leading zero .