# 切片物件

PyTypeObject PySlice_Type
  為 穩定 ABI 的一部分.

  The type object for slice objects. This is the same as `slice` in the Python layer.

int PySlice_Check( PyObject *ob)

  Return true if ob is a slice object; ob must not be `NULL`. This function always succeeds.

PyObject *PySlice_New( PyObject *start, PyObject *stop, PyObject *step)
  回傳值：新的參照。 為 穩定 ABI 的一部分.

  Return a new slice object with the given values. The start, stop, and step parameters are used as the values of the slice object attributes of the same names. Any of the values may be `NULL`, in which case the `None` will be used for the corresponding attribute.

  Return `NULL` with an exception set if the new object could not be allocated.

int PySlice_GetIndices( PyObject *slice, Py_ssize_t length, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)
  為 穩定 ABI 的一部分.

  Retrieve the start, stop and step indices from the slice object slice, assuming a sequence of length length. Treats indices greater than length as errors.

  Returns `0` on success and `-1` on error with no exception set (unless one of the indices was not `None` and failed to be converted to an integer, in which case `-1` is returned with an exception set).

  You probably do not want to use this function.

  在 3.2 版的變更: The parameter type for the slice parameter was `PySliceObject*` before.

int PySlice_GetIndicesEx( PyObject *slice, Py_ssize_t length, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step, Py_ssize_t *slicelength)
  為 穩定 ABI 的一部分.

  Usable replacement for `PySlice_GetIndices()`. Retrieve the start, stop, and step indices from the slice object slice assuming a sequence of length length, and store the length of the slice in slicelength. Out of bounds indices are clipped in a manner consistent with the handling of normal slices.

  成功時回傳 `0` ，在失敗時回傳 `-1` 並設定例外。

  備註

  This function is considered not safe for resizable sequences. Its invocation should be replaced by a combination of `PySlice_Unpack()` and `PySlice_AdjustIndices()` where

      if (PySlice_GetIndicesEx(slice, length, &start, &stop, &step, &slicelength) < 0) {
          // return error
      }

  is replaced by

      if (PySlice_Unpack(slice, &start, &stop, &step) < 0) {
          // return error
      }
      slicelength = PySlice_AdjustIndices(length, &start, &stop, step);

  在 3.2 版的變更: The parameter type for the slice parameter was `PySliceObject*` before.

  在 3.6.1 版的變更: If `Py_LIMITED_API` is not set or set to the value between `0x03050400` and `0x03060000` (not including) or `0x03060100` or higher `PySlice_GetIndicesEx()` is implemented as a macro using `PySlice_Unpack()` and `PySlice_AdjustIndices()`. Arguments start, stop and step are evaluated more than once.

  在 3.6.1 版之後被棄用: If `Py_LIMITED_API` is set to the value less than `0x03050400` or between `0x03060000` and `0x03060100` (not including) `PySlice_GetIndicesEx()` is a deprecated function.

int PySlice_Unpack( PyObject *slice, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)
  為 穩定 ABI 的一部分 自 3.7 版本開始.

  Extract the start, stop and step data members from a slice object as C integers. Silently reduce values larger than `PY_SSIZE_T_MAX` to `PY_SSIZE_T_MAX`, silently boost the start and stop values less than `PY_SSIZE_T_MIN` to `PY_SSIZE_T_MIN`, and silently boost the step values less than `-PY_SSIZE_T_MAX` to `-PY_SSIZE_T_MAX`.

  成功時回傳 `0`，在失敗時回傳 `-1` 並設定例外。

  在 3.6.1 版被加入.

Py_ssize_t PySlice_AdjustIndices( Py_ssize_t length, Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t step)
  為 穩定 ABI 的一部分 自 3.7 版本開始.

  Adjust start/end slice indices assuming a sequence of the specified length. Out of bounds indices are clipped in a manner consistent with the handling of normal slices.

  Return the length of the slice. Always successful. Doesn't call Python code.

  在 3.6.1 版被加入.

## Ellipsis Object

PyObject *Py_Ellipsis

  The Python `Ellipsis` object. This object has no methods. Like `Py_None`, it is an immortal singleton object.

  在 3.12 版的變更: `Py_Ellipsis` 為不滅的 (immortal)。