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Fix SF bug #763023, difflib.py: ratio() zero division not caught

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Backport candidate
This commit is contained in:
Neal Norwitz 2003-07-01 14:59:46 +00:00
parent 37ca8c12dc
commit e7dfe21bed
3 changed files with 23 additions and 3 deletions
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12
Lib/test/test_difflib.py
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@ -1,3 +1,15 @@
import difflib
from test import test_support
import unittest
class TestSFbugs(unittest.TestCase):
def test_ratio_for_null_seqn(self):
# Check clearing of SF bug 763023
s = difflib.SequenceMatcher(None, [], [])
self.assertEqual(s.ratio(), 1)
self.assertEqual(s.quick_ratio(), 1)
self.assertEqual(s.real_quick_ratio(), 1)
test_support.run_unittest(TestSFbugs)
test_support.run_doctest(difflib)