plural1.py源代码分析

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"""Pluralize English nouns (stage 1)

This program is part of "Dive Into Python", a free Python book for

experienced programmers. Visit http://diveintopython.org/ for the

latest version.

Command line usage:

$ python plural1.py noun

nouns

"""

__author__ = "Mark Pilgrim ([e-mail])"

__version__ = "$Revision: 1.3 $"

__date__ = "$Date: 2004/03/18 16:43:37 $"

__copyright__ = "Copyright (c) 2004 Mark Pilgrim"

__license__ = "Python"

import re

def plural(noun):

if re.search('[sxz]$', noun):

return re.sub('$', 'es', noun)

#如果以s、x、z中的任意一个结尾，则直接在末尾加es变为复数

elif re.search('[^aeioudgkprt]h$', noun):

return re.sub('$', 'es', noun)

#如果以除aeioudgkprt中的任意一个字母和h结尾，则也加es变为复数

elif re.search('[^aeiou]y$', noun):

return re.sub('y$', 'ies', noun)

#如果以除aeiou中的任意一个字母和y结尾，则将结尾的y去掉，然后加ies变为复数

else:

return noun + 's'

#其他的所有情况都是在单词末尾加s变为复数

if __name__ == '__main__':

import sys

#导入sys模块

if sys.argv[1:]:

print plural(sys.argv[1])

打印第一个参数的复数形式

else:

print __doc__