def country_code_for_region(region_code):
 if (not _is_valid_region_code(region_code)):
  return 0
 return country_code_for_valid_region(region_code)

def country_code_for_region ( region_code ) : if ( not _is_valid_region_code ( region_code ) ) : return 0 return country_code_for_valid_region ( region_code )
returns the country calling code for a specific region .