Define function to Open a file，definefunction,import sysde

Define function to Open a file，definefunction,import sysde

import sysdef open_file(file_name, mode):    '''Open a file.'''    try:        the_file = open(file_name, mode)    except(IOError), e:        print 'Unable to open the file', file_name, 'Ending program.\n', e        raw_input('\n\nPress the enter key to exit.')        sys.exit()    else:        return the_filetrivia_file = open_file('trivia.txt', 'r')