...........E..EF

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

ERROR: testOpen (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 49, in testOpen

    self.assertFalse(i.open())

AttributeError: Interval instance has no attribute 'open'



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

ERROR: testSum (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 103, in testSum

    self.assertEqual(Interval(6, None), Interval(6, 18) + Interval(18, None))

  File ".../fn43598/2007-04-04 18:46:04/user.py", line 251, in __add__

    if self.left()<other.left()<=self.right()<other.right():

  File ".../fn43598/2007-04-04 18:46:04/user.py", line 47, in right

    raise ValueError("Incorrect Calling")

ValueError: Incorrect Calling



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

FAIL: testUnequal (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 88, in testUnequal

    self.assertFalse(Interval(None, -8) != Interval(None, -8))

AssertionError



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Ran 16 tests in 0.006s



FAILED (failures=1, errors=2)