cython

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cdef extern from "Python.h":
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    # PyTypeObject PySlice_Type
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    #
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    # The type object for slice objects. This is the same as slice and types.SliceType
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    bint PySlice_Check(object ob)
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    #
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    # Return true if ob is a slice object; ob must not be NULL.
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    slice PySlice_New(object start, object stop, object step)
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    #
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    # Return a new slice object with the given values. The start, stop, and step
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    # parameters are used as the values of the slice object attributes of the same
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    # names. Any of the values may be NULL, in which case the None will be used
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    # for the corresponding attribute. Return NULL if the new object could not be
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    # allocated.
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    int PySlice_GetIndices(object slice, Py_ssize_t length,
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                           Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step) except? -1
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    #
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    # Retrieve the start, stop and step indices from the slice object slice,
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    # assuming a sequence of length length. Treats indices greater than length
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    # as errors.
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    #
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    # Returns 0 on success and -1 on error with no exception set (unless one
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    # of the indices was not None and failed to be converted to an integer,
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    # in which case -1 is returned with an exception set).
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    #
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    # You probably do not want to use this function.
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    #
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    # Changed in version 3.2: The parameter type for the slice parameter was
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    # PySliceObject* before.
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    int PySlice_GetIndicesEx(object slice, Py_ssize_t length,
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                             Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step,
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                             Py_ssize_t *slicelength) except -1
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    #
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    # Usable replacement for PySlice_GetIndices(). Retrieve the start, stop, and step
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    # indices from the slice object slice assuming a sequence of length length, and
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    # store the length of the slice in slicelength. Out of bounds indices are clipped
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    # in a manner consistent with the handling of normal slices.
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    #
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    # Returns 0 on success and -1 on error with exception set.
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    #
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    # Changed in version 3.2: The parameter type for the slice parameter was
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    # PySliceObject* before.
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    int PySlice_Unpack(object slice, Py_ssize_t *start, Py_ssize_t *stop,
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                       Py_ssize_t *step) except -1
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    # Extract the start, stop and step data members from a slice object as C
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    # integers. Silently reduce values larger than PY_SSIZE_T_MAX to
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    # PY_SSIZE_T_MAX, silently boost the start and stop values less than
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    # PY_SSIZE_T_MIN to PY_SSIZE_T_MIN, and silently boost the step values
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    # less than -PY_SSIZE_T_MAX to -PY_SSIZE_T_MAX.
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    # Return -1 on error, 0 on success.
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    # New in version 3.6.1.
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    Py_ssize_t PySlice_AdjustIndices(Py_ssize_t length, Py_ssize_t *start,
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                                     Py_ssize_t *stop, Py_ssize_t step)
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    # Adjust start/end slice indices assuming a sequence of the specified
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    # length. Out of bounds indices are clipped in a manner consistent with
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    # the handling of normal slices.
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    # Return the length of the slice. Always successful. Doesn’t call Python
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    # code.
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    # New in version 3.6.1.
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