....E.....E.....

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

ERROR: testHash (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 92, in testHash

    self.assertEqual(hash(Interval(3, 11)), hash(Interval(3, 11)))

TypeError: __hash__() should return an int



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

ERROR: testLen (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 97, in testLen

    self.assertEqual(0, len(Interval(-22, None)))

  File ".../fn43969/2007-03-31 10:34:26/user.py", line 154, in __len__

    a = int(abs(self.Right - self.Left))

TypeError: unsupported operand type(s) for -: 'NoneType' and 'float'



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

Ran 16 tests in 0.006s



FAILED (errors=2)