[New-bugs-announce] [issue15477] test_cmath failures on OS X 10.8

Ned Deily report at bugs.python.org
Sat Jul 28 12:03:57 CEST 2012


New submission from Ned Deily <nad at acm.org>:

======================================================================
FAIL: testAtanSign (test.test_cmath.CMathTests)
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Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/test/test_cmath.py", line 526, in testAtanSign
    self.assertComplexIdentical(cmath.atan(z), z)
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/test/test_cmath.py", line 96, in assertComplexIdentical
    self.assertFloatIdentical(x.imag, y.imag)
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/test/test_cmath.py", line 86, in assertFloatIdentical
    self.fail(msg.format(x, y))
AssertionError: floats -0.0 and 0.0 are not identical: zeros have different signs

======================================================================
FAIL: testAtanhSign (test.test_cmath.CMathTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/test/test_cmath.py", line 533, in testAtanhSign
    self.assertComplexIdentical(cmath.atanh(z), z)
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/test/test_cmath.py", line 95, in assertComplexIdentical
    self.assertFloatIdentical(x.real, y.real)
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/test/test_cmath.py", line 86, in assertFloatIdentical
    self.fail(msg.format(x, y))
AssertionError: floats 0.0 and -0.0 are not identical: zeros have different signs

======================================================================
FAIL: test_specific_values (test.test_cmath.CMathTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/test/test_cmath.py", line 382, in test_specific_values
    msg=error_message)
  File "/Library/Frameworks/Python.framework/Versions/3.3/lib/python3.3/test/test_cmath.py", line 128, in rAssertAlmostEqual
    'got {!r}'.format(a, b))
AssertionError: atan1000: atan(complex(-0.0, 0.0))
Expected: complex(-0.0, 0.0)
Received: complex(-0.0, -0.0)
Received value insufficiently close to expected value.

----------------------------------------------------------------------

Failures seen across various compilers and deployment targets and running the tests with the same binaries on earlier OS X versions do not fail.

FWIW, the Apple-supplied Python 2.7.2 in 10.8 (that's the most recent version supplied) also has a test_cmath failure:

======================================================================
FAIL: test_specific_values (test.test_cmath.CMathTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/test/test_cmath.py", line 352, in test_specific_values
    msg=error_message)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/test/test_cmath.py", line 94, in rAssertAlmostEqual
    'got {!r}'.format(a, b))
AssertionError: atan0000: atan(complex(0.0, 0.0))
Expected: complex(0.0, 0.0)
Received: complex(0.0, -0.0)
Received value insufficiently close to expected value.

----------------------------------------------------------------------

Is there any reason to not consider this a platform bug?  If it is, what should the bug report be?

----------
messages: 166642
nosy: mark.dickinson, ned.deily
priority: normal
severity: normal
status: open
title: test_cmath failures on OS X 10.8
versions: Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue15477>
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