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    >>> parse_vrange('3.2-4.0')
    ((3, 2), (4, 0))
    >>> parse_vrange('-3.7')
    (None, (3, 7))
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    >>> parse_pycentral_vrange('3.1')
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    >>> parse_pycentral_vrange('3.1, 3.2')
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    '3.4-3.6'
    >>> vrange_str(((3, 4), (4, 0)))
    '3.4-4.0'
    >>> vrange_str((None, (3, 7)))
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        same format is used as in :param:`versions`

    >>> debsorted([(2, 6), (3, 1), (3, 2), (3, 3), (2, 7)])[0] == DEFAULT
    True
    >>> debsorted(('2.4', '3.2', '2.6', '2.7'))[-1]
    (2, 4)
    >>> debsorted(set([(2, 1), (2, 2)]))
    [(2, 2), (2, 1)]
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