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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
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FAIL: testAtanhSign (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 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
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FAIL: test_specific_values (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 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.
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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:
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FAIL: test_specific_values (test.test_cmath.CMathTests)
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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.
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Is there any reason to not consider this a platform bug? If it is, what should the bug report be?