[Python-Dev] RE: test_sort.py failure (original) (raw)

Armin Rigo arigo at tunes.org
Thu Jul 29 12:07:28 CEST 2004

Hello again,

I will check the following test in when it is fixed:

def test_undetected_mutation(self):
    # Python 2.4a1 did not always detect mutation
    memorywaster = []
    for i in range(20):
        def mutating_cmp(x, y):
            L.append(3)
            L.pop()
            return cmp(x, y)
        L = [1,2]
        self.assertRaises(ValueError, L.sort, mutating_cmp)
        def mutating_cmp(x, y):
            L.append(3)
            del L[:]
            return cmp(x, y)
        self.assertRaises(ValueError, L.sort, mutating_cmp)
        memorywaster = [memorywaster]

In the two parts, the list is emptied using two different ways: L.pop() which uses list_resize(), and del L[:] which uses list_ass_slice(). On my Linux machine, the first test eventually fails on yesterday's CVS head, but the second one passes. Conversely, today's CVS makes the first test pass but the second one fail.

Armin

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