cython

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# mode: run
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# ticket 636
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# tag: slicing, getitem
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class Sliceable(object):
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    """
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    >>> sl = Sliceable()
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    >>> sl[1:2]
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    (1, 2, None)
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    >>> py_slice2(sl, 1, 2)
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    (1, 2, None)
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    >>> sl[1:None]
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    (1, None, None)
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    >>> py_slice2(sl, 1, None)
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    (1, None, None)
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    >>> sl[None:2]
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    (None, 2, None)
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    >>> py_slice2(sl, None, 2)
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    (None, 2, None)
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    >>> sl[None:None]
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    (None, None, None)
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    >>> py_slice2(sl, None, None)
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    (None, None, None)
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    """
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    def __getitem__(self, sl):
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        return (sl.start, sl.stop, sl.step)
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def py_slice2(obj,a,b):
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    """
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    >>> [1,2,3][1:2]
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    [2]
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    >>> py_slice2([1,2,3], 1, 2)
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    [2]
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    >>> [1,2,3][None:2]
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    [1, 2]
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    >>> py_slice2([1,2,3], None, 2)
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    [1, 2]
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    >>> [1,2,3][None:None]
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    [1, 2, 3]
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    >>> py_slice2([1,2,3], None, None)
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    [1, 2, 3]
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    """
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    return obj[a:b]
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