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Issue #1772851. Alters long.__hash__ from being *almost* completely

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predictable to being completely predictable.  The value of hash(n)
is unchanged for any n that's small enough to be representable as an
int, and also unchanged for the vast majority of long integers n of
reasonable size.
This commit is contained in:
Facundo Batista 2007-09-19 15:10:06 +00:00
parent 673debfd63
commit d544df7ddd
2 changed files with 19 additions and 0 deletions
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11
Lib/test/test_hash.py
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@ -18,10 +18,21 @@ class HashEqualityTestCase(unittest.TestCase):
def test_numeric_literals(self):
self.same_hash(1, 1L, 1.0, 1.0+0.0j)
self.same_hash(0, 0L, 0.0, 0.0+0.0j)
self.same_hash(-1, -1L, -1.0, -1.0+0.0j)
self.same_hash(-2, -2L, -2.0, -2.0+0.0j)
def test_coerced_integers(self):
self.same_hash(int(1), long(1), float(1), complex(1),
int('1'), float('1.0'))
self.same_hash(int(-2**31), long(-2**31), float(-2**31))
self.same_hash(int(1-2**31), long(1-2**31), float(1-2**31))
self.same_hash(int(2**31-1), long(2**31-1), float(2**31-1))
# for 64-bit platforms
self.same_hash(int(2**31), long(2**31), float(2**31))
self.same_hash(int(-2**63), long(-2**63), float(-2**63))
self.same_hash(int(1-2**63), long(1-2**63))
self.same_hash(int(2**63-1), long(2**63-1))
def test_coerced_floats(self):
self.same_hash(long(1.23e300), float(1.23e300))