diff options
| author | Raymond Hettinger <python@rcn.com> | 2010-04-05 18:53:43 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2010-04-05 18:53:43 (GMT) |
| commit | e1d665a90e4a20a60c0c9904417160ea3c7660b7 (patch) | |
| tree | b70e4a64cd4a6a5ec6023fbe35069b4eb5af37fc | |
| parent | 5e0c2748fb2e16b3b0f33f0bb55f1aaa1272f887 (diff) | |
| download | cpython-e1d665a90e4a20a60c0c9904417160ea3c7660b7.zip cpython-e1d665a90e4a20a60c0c9904417160ea3c7660b7.tar.gz cpython-e1d665a90e4a20a60c0c9904417160ea3c7660b7.tar.bz2 | |
Classes that override __eq__ also need to define __hash__.
| -rw-r--r-- | Lib/functools.py | 2 | ||||
| -rw-r--r-- | Lib/test/test_functools.py | 7 |
2 files changed, 9 insertions, 0 deletions
diff --git a/Lib/functools.py b/Lib/functools.py index ad1cccc..539dc90 100644 --- a/Lib/functools.py +++ b/Lib/functools.py @@ -93,4 +93,6 @@ def cmp_to_key(mycmp): return mycmp(self.obj, other.obj) >= 0 def __ne__(self, other): return mycmp(self.obj, other.obj) != 0 + def __hash__(self): + raise TypeError('hash not implemented') return K diff --git a/Lib/test/test_functools.py b/Lib/test/test_functools.py index 1629f7c..05e19b1 100644 --- a/Lib/test/test_functools.py +++ b/Lib/test/test_functools.py @@ -345,6 +345,13 @@ class TestCmpToKey(unittest.TestCase): self.assertEqual(sorted(range(5), key=functools.cmp_to_key(mycmp)), [4, 3, 2, 1, 0]) + def test_hash(self): + def mycmp(x, y): + return y - x + key = functools.cmp_to_key(mycmp) + k = key(10) + self.assertRaises(TypeError, hash(k)) + class TestTotalOrdering(unittest.TestCase): def test_total_ordering_lt(self): |