1cdef extern from "Python.h":
2
3    # PyTypeObject PySlice_Type
4    #
5    # The type object for slice objects. This is the same as slice and types.SliceType
6
7    bint PySlice_Check(object ob)
8    #
9    # Return true if ob is a slice object; ob must not be NULL.
10
11    slice PySlice_New(object start, object stop, object step)
12    #
13    # Return a new slice object with the given values. The start, stop, and step
14    # parameters are used as the values of the slice object attributes of the same
15    # names. Any of the values may be NULL, in which case the None will be used
16    # for the corresponding attribute. Return NULL if the new object could not be
17    # allocated.
18
19    int PySlice_GetIndices(object slice, Py_ssize_t length,
20                           Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step) except? -1
21    #
22    # Retrieve the start, stop and step indices from the slice object slice,
23    # assuming a sequence of length length. Treats indices greater than length
24    # as errors.
25    #
26    # Returns 0 on success and -1 on error with no exception set (unless one
27    # of the indices was not None and failed to be converted to an integer,
28    # in which case -1 is returned with an exception set).
29    #
30    # You probably do not want to use this function.
31    #
32    # Changed in version 3.2: The parameter type for the slice parameter was
33    # PySliceObject* before.
34
35    int PySlice_GetIndicesEx(object slice, Py_ssize_t length,
36                             Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step,
37                             Py_ssize_t *slicelength) except -1
38    #
39    # Usable replacement for PySlice_GetIndices(). Retrieve the start, stop, and step
40    # indices from the slice object slice assuming a sequence of length length, and
41    # store the length of the slice in slicelength. Out of bounds indices are clipped
42    # in a manner consistent with the handling of normal slices.
43    #
44    # Returns 0 on success and -1 on error with exception set.
45    #
46    # Changed in version 3.2: The parameter type for the slice parameter was
47    # PySliceObject* before.
48
49    int PySlice_Unpack(object slice, Py_ssize_t *start, Py_ssize_t *stop,
50                       Py_ssize_t *step) except -1
51    # Extract the start, stop and step data members from a slice object as C
52    # integers. Silently reduce values larger than PY_SSIZE_T_MAX to
53    # PY_SSIZE_T_MAX, silently boost the start and stop values less than
54    # PY_SSIZE_T_MIN to PY_SSIZE_T_MIN, and silently boost the step values
55    # less than -PY_SSIZE_T_MAX to -PY_SSIZE_T_MAX.
56
57    # Return -1 on error, 0 on success.
58
59    # New in version 3.6.1.
60
61    Py_ssize_t PySlice_AdjustIndices(Py_ssize_t length, Py_ssize_t *start,
62                                     Py_ssize_t *stop, Py_ssize_t step)
63    # Adjust start/end slice indices assuming a sequence of the specified
64    # length. Out of bounds indices are clipped in a manner consistent with
65    # the handling of normal slices.
66
67    # Return the length of the slice. Always successful. Doesn’t call Python
68    # code.
69
70    # New in version 3.6.1.
71