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Fix compile.c so that it records 0.0 and -0.0 as separate constants in a code

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object's co_consts tuple; add a test to show that the previous behavior (where
these two constants were "collapsed" into one) causes serious malfunctioning.
This commit is contained in:
Alex Martelli 2007-08-22 21:14:17 +00:00
parent 89e975fc74
commit d8672aa8a4
2 changed files with 29 additions and 1 deletions
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15
Lib/test/test_float.py
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@ -81,6 +81,7 @@ class UnknownFormatTestCase(unittest.TestCase):
# on an IEEE platform, all we guarantee is that bit patterns
# representing infinities or NaNs do not raise an exception; all else
# is accident (today).
# let's also try to guarantee that -0.0 and 0.0 don't get confused.
class IEEEFormatTestCase(unittest.TestCase):
if float.__getformat__("double").startswith("IEEE"):
@ -99,6 +100,20 @@ class IEEEFormatTestCase(unittest.TestCase):
('<f', LE_FLOAT_NAN)]:
struct.unpack(fmt, data)
if float.__getformat__("double").startswith("IEEE"):
def test_negative_zero(self):
import math
def pos_pos():
return 0.0, math.atan2(0.0, -1)
def pos_neg():
return 0.0, math.atan2(-0.0, -1)
def neg_pos():
return -0.0, math.atan2(0.0, -1)
def neg_neg():
return -0.0, math.atan2(-0.0, -1)
self.assertEquals(pos_pos(), neg_pos())
self.assertEquals(pos_neg(), neg_neg())
def test_main():
test_support.run_unittest(