..........F.E...

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

ERROR: 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)))

  File "<string>", line 1, in <module>

NameError: name '__builtin__' is not defined



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

FAIL: testLen (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 99, in testLen

    self.assertEqual(7, len(Interval(-2, 4.1)))

AssertionError: 7 != 6



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Ran 16 tests in 0.008s



FAILED (failures=1, errors=1)