............F...

======================================================================

FAIL: testRepr (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 25, in testRepr

    self.assertEqual(i, eval(repr(i)))

AssertionError: Interval('- infinity',131.0) != Interval('- infinity',131.0)



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Ran 16 tests in 0.006s



FAILED (failures=1)