[issue21321] itertools.islice() doesn't release reference to the source iterator when the slice is exhausted

[Antoine Pitrou]

Antoine Pitrou added the comment:

For the record, checks such as:

        self.assertEqual(wr() is None, False)

are better written:

        self.assertIsNotNone(wr())

No need to upload a new patch, I'm gonna make the change while committing :-)

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<http://bugs.python.org/issue21321>
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