.F.......EF.E...

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

ERROR: testLeftRight (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 57, in testLeftRight

    self.assertEqual(-5.0, i.left())

TypeError: 'float' object is not callable



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

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>

TypeError: 'classobj' object is unsubscriptable



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

FAIL: testContains (tester.ProblemTests)

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Traceback (most recent call last):

  File ".../test.py", line 85, in testContains

    self.assertFalse(Interval(None, -8).contains(Interval(-8, None)))

AssertionError



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

FAIL: testLen (tester.ProblemTests)

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

Traceback (most recent call last):

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

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

AssertionError: 7 != 6



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

Ran 16 tests in 0.006s



FAILED (failures=2, errors=2)