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Issue 10534, difflib: tweak doc; test new SequenceMatcher instance attributes; avoid unneeded lists of SM.b2j keys and items in .__chain_b. Do not backport.

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This commit is contained in:
Terry Reedy 2010-12-15 20:18:10 +00:00
parent 50ba19ee45
commit 17a59252e8
3 changed files with 28 additions and 9 deletions
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17
Lib/test/test_difflib.py
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@ -12,12 +12,14 @@ class TestWithAscii(unittest.TestCase):
self.assertEqual(list(sm.get_opcodes()),
[ ('insert', 0, 0, 0, 1),
('equal', 0, 100, 1, 101)])
self.assertEqual(sm.bpopular, set())
sm = difflib.SequenceMatcher(None, 'b' * 100, 'b' * 50 + 'a' + 'b' * 50)
self.assertAlmostEqual(sm.ratio(), 0.995, places=3)
self.assertEqual(list(sm.get_opcodes()),
[ ('equal', 0, 50, 0, 50),
('insert', 50, 50, 50, 51),
('equal', 50, 100, 51, 101)])
self.assertEqual(sm.bpopular, set())
def test_one_delete(self):
sm = difflib.SequenceMatcher(None, 'a' * 40 + 'c' + 'b' * 40, 'a' * 40 + 'b' * 40)
@ -27,6 +29,19 @@ class TestWithAscii(unittest.TestCase):
('delete', 40, 41, 40, 40),
('equal', 41, 81, 40, 80)])
def test_bjunk(self):
sm = difflib.SequenceMatcher(isjunk=lambda x: x == ' ',
a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40)
self.assertEqual(sm.bjunk, set())
sm = difflib.SequenceMatcher(isjunk=lambda x: x == ' ',
a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40 + ' ' * 20)
self.assertEqual(sm.bjunk, {' '})
sm = difflib.SequenceMatcher(isjunk=lambda x: x in [' ', 'b'],
a='a' * 40 + 'b' * 40, b='a' * 44 + 'b' * 40 + ' ' * 20)
self.assertEqual(sm.bjunk, {' ', 'b'})
class TestAutojunk(unittest.TestCase):
"""Tests for the autojunk parameter added in 2.7"""
@ -38,10 +53,12 @@ class TestAutojunk(unittest.TestCase):
sm = difflib.SequenceMatcher(None, seq1, seq2)
self.assertAlmostEqual(sm.ratio(), 0, places=3)
self.assertEqual(sm.bpopular, {'b'})
# Now turn the heuristic off
sm = difflib.SequenceMatcher(None, seq1, seq2, autojunk=False)
self.assertAlmostEqual(sm.ratio(), 0.9975, places=3)
self.assertEqual(sm.bpopular, set())
class TestSFbugs(unittest.TestCase):