mirror of
https://github.com/kennethreitz/dive-into-python3.git
synced 2026-06-05 15:00:18 +00:00
Mark Pilgrim
74 lines
2.2 KiB
Python
74 lines
2.2 KiB
Python
'''Pluralize English nouns (stage 2)
|
|
|
|
Command line usage:
|
|
$ python plural2.py noun
|
|
nouns
|
|
'''
|
|
|
|
import re
|
|
|
|
def match_sxz(noun):
|
|
return re.search('[sxz]$', noun)
|
|
|
|
def apply_sxz(noun):
|
|
return re.sub('$', 'es', noun)
|
|
|
|
def match_h(noun):
|
|
return re.search('[^aeioudgkprt]h$', noun)
|
|
|
|
def apply_h(noun):
|
|
return re.sub('$', 'es', noun)
|
|
|
|
def match_y(noun):
|
|
return re.search('[^aeiou]y$', noun)
|
|
|
|
def apply_y(noun):
|
|
return re.sub('y$', 'ies', noun)
|
|
|
|
def match_default(noun):
|
|
return True
|
|
|
|
def apply_default(noun):
|
|
return noun + 's'
|
|
|
|
rules = ((match_sxz, apply_sxz),
|
|
(match_h, apply_h),
|
|
(match_y, apply_y),
|
|
(match_default, apply_default)
|
|
)
|
|
|
|
def plural(noun):
|
|
for matches_rule, apply_rule in rules:
|
|
if matches_rule(noun):
|
|
return apply_rule(noun)
|
|
|
|
if __name__ == '__main__':
|
|
import sys
|
|
if sys.argv[1:]:
|
|
print(plural(sys.argv[1]))
|
|
else:
|
|
print(__doc__)
|
|
|
|
# Copyright (c) 2009, Mark Pilgrim, All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without modification,
|
|
# are permitted provided that the following conditions are met:
|
|
#
|
|
# * Redistributions of source code must retain the above copyright notice,
|
|
# this list of conditions and the following disclaimer.
|
|
# * Redistributions in binary form must reproduce the above copyright notice,
|
|
# this list of conditions and the following disclaimer in the documentation
|
|
# and/or other materials provided with the distribution.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
|
|
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
# POSSIBILITY OF SUCH DAMAGE.
|