"""Pluralize English nouns (stage 3)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 plural3.py nounnouns"""__author__ = "Mark Pilgrim (mark@diveintopython.org)"__version__ = "$Revision: 1.3 $"__date__ = "$Date: 2004/03/18 16:43:37 $"__copyright__ = "Copyright (c) 2004 Mark Pilgrim"__license__ = "Python"import rerules = \  (    (     lambda word: re.search('[sxz]$', word),     lambda word: re.sub('$', 'es', word)     ),    (     lambda word: re.search('[^aeioudgkprt]h$', word),     lambda word: re.sub('$', 'es', word)    ),    (     lambda word: re.search('[^aeiou]y$', word),     lambda word: re.sub('y$', 'ies', word)    ),    (     lambda word: re.search('$', word),     lambda word: re.sub('$', 's', word)    )  )    def plural(noun):    for matchesRule, applyRule in rules:        if matchesRule(noun):            return applyRule(noun)if __name__ == '__main__':    import sys    if sys.argv[1:]:        print plural(sys.argv[1])    else:        print __doc__