Hi,

I was checking out the unittest module and try out the sample code. I save the code below in a file call "testrandom.py" and run it using IDLE (Python's default IDE), but I get the following in red. Obviously, the tests run fine as indicated by OK, but why did I get that traceback "error"?

Btw, I'm using Python 2.7.

...
----------------------------------------------------------------------
Ran 3 tests in 0.018s

OK

Traceback (most recent call last):
File "C:\python\testrandom.py", line 29, in <module>
unittest.main()
File "C:\PYTHON27\LIB\unittest\main.py", line 95, in __init__
self.runTests()
File "C:\PYTHON27\LIB\unittest\main.py", line 231, in runTests
sys.exit(not self.result.wasSuccessful())
SystemExit: False

import random
    import unittest

    class TestSequenceFunctions(unittest.TestCase):

        def setUp(self):
            self.seq = range(10)

        def test_shuffle(self):
            # make sure the shuffled sequence does not lose any elements
            random.shuffle(self.seq)
            self.seq.sort()
            self.assertEqual(self.seq, range(10))

            # should raise an exception for an immutable sequence
            self.assertRaises(TypeError, random.shuffle, (1,2,3))

        def test_choice(self):
            element = random.choice(self.seq)
            self.assertTrue(element in self.seq)

        def test_sample(self):
            with self.assertRaises(ValueError):
                random.sample(self.seq, 20)
            for element in random.sample(self.seq, 5):
                self.assertTrue(element in self.seq)

    if __name__ == '__main__':
        unittest.main()

In idle, sys.exit doesn't exit the process. Instead, the exception is caught and displayed

>>> import sys
>>> sys.exit(False)

Traceback (most recent call last):
  File "<pyshell#3>", line 1, in <module>
    sys.exit(False)
SystemExit: False

You would run the test from command window or you would double click the file in graphical file manager.

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