def get_plural_value(value):
if value.endswith('ife'):
return value[:-3] + 'ives'
elif any(
value.endswith('{}f'.format(ending))
for ending in ('al', 'el', 'ar', 'ea', 'ol')):
return value[:-1] + 'ves'
else:
return add_s(value)
def third_person(self):
if self.has_tags(WordTag.THIRD_PERSON):
return self
new_tags = self.tags.add(WordTag.THIRD_PERSON).remove(WordTag.PAST)
if self.has_tags(WordTag.NEGATIVE):
return Verb("doesn't " + self.infinitive, self.irregular_past,
self.infinitive, new_tags)
with_s = add_s(self.infinitive)
if with_s == 'haves':
with_s = 'has'
return Verb(with_s, self.irregular_past, self.infinitive, new_tags)
def test_add_s_needs_es(self):
es_words = ('buzz', 'fitch', 'fess', 'ax', 'dish', 'bobo')
for word in es_words:
self.assertEqual(add_s(word), word + 'es')
def test_add_s_others(self):
self.assertEqual(add_s('play'), 'plays')
self.assertEqual(add_s('baa'), 'baas')
self.assertEqual(add_s('egg'), 'eggs')
def test_add_s_ies(self):
self.assertEqual(add_s('baby'), 'babies')
self.assertEqual(add_s('harpy'), 'harpies')
self.assertEqual(add_s('cry'), 'cries')
self.assertNotEqual(add_s('play'), 'plaies')