cython

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# mode: run
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def do_slice(s, int i, int j):
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    """
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    >>> do_slice(b'abcdef', 2, 3)
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    (b'c', b'cdef', b'ab', b'abcdef', b'cdef', b'ab', b'abcdef')
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    >>> do_slice(b'abcdef', 0, 5)
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    (b'abcde', b'abcdef', b'', b'abcdef', b'abcdef', b'', b'abcdef')
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    """
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    cdef char* ss = s
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    return ss[i:j], ss[i:], ss[:i], ss[:], ss[i:None], ss[None:i], ss[None:None]
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