"""Pluralize English nouns (stage 1)This program is part of "Dive Into Python", a free Python book forexperienced programmers.  Visit http://diveintopython.org/ for thelatest version.Command line usage:$ python plural1.py nounnouns"""__author__ = "Mark Pilgrim (mark@diveintopython.org)"__version__ = "$Revision: 1.3 $"__date__ = "$Date: 2004/03/18 16:43:37 $"__copyright__ = "Copyright (c) 2004 Mark Pilgrim"__license__ = "Python"import redef plural(noun):    if re.search('[sxz]$', noun):        return re.sub('$', 'es', noun)    elif re.search('[^aeioudgkprt]h$', noun):        return re.sub('$', 'es', noun)    elif re.search('[^aeiou]y$', noun):        return re.sub('y$', 'ies', noun)    else:        return noun + 's'if __name__ == '__main__':    import sys    if sys.argv[1:]:        print plural(sys.argv[1])    else:        print __doc__