.. highlightlang:: c

Sequence Protocol

.. c:function:: int PySequence_Check(PyObject *o)

 Return ``1`` if the object provides sequence protocol, and ``0`` otherwise.
 Note that it returns ``1`` for Python classes with a :meth:`__getitem__`
 method unless they are :class:`dict` subclasses since in general case it
 is impossible to determine what the type of keys it supports. This
 function always succeeds.

.. c:function:: Py_ssize_t PySequence_Size(PyObject *o)
 Py_ssize_t PySequence_Length(PyObject *o)

 .. index:: builtin: len

 Returns the number of objects in sequence *o* on success, and ``-1`` on
 failure. This is equivalent to the Python expression ``len(o)``.

.. c:function:: PyObject* PySequence_Concat(PyObject *o1, PyObject *o2)

 Return the concatenation of *o1* and *o2* on success, and *NULL* on failure.
 This is the equivalent of the Python expression ``o1 + o2``.

.. c:function:: PyObject* PySequence_Repeat(PyObject *o, Py_ssize_t count)

 Return the result of repeating sequence object *o* *count* times, or *NULL* on
 failure. This is the equivalent of the Python expression ``o * count``.

.. c:function:: PyObject* PySequence_InPlaceConcat(PyObject *o1, PyObject *o2)

 Return the concatenation of *o1* and *o2* on success, and *NULL* on failure.
 The operation is done *in-place* when *o1* supports it. This is the equivalent
 of the Python expression ``o1 += o2``.

.. c:function:: PyObject* PySequence_InPlaceRepeat(PyObject *o, Py_ssize_t count)

 Return the result of repeating sequence object *o* *count* times, or *NULL* on
 failure. The operation is done *in-place* when *o* supports it. This is the
 equivalent of the Python expression ``o *= count``.

.. c:function:: PyObject* PySequence_GetItem(PyObject *o, Py_ssize_t i)

 Return the *i*\ th element of *o*, or *NULL* on failure. This is the equivalent of
 the Python expression ``o[i]``.

.. c:function:: PyObject* PySequence_GetSlice(PyObject *o, Py_ssize_t i1, Py_ssize_t i2)

 Return the slice of sequence object *o* between *i1* and *i2*, or *NULL* on
 failure. This is the equivalent of the Python expression ``o[i1:i2]``.

.. c:function:: int PySequence_SetItem(PyObject *o, Py_ssize_t i, PyObject *v)

 Assign object *v* to the *i*\ th element of *o*. Raise an exception
 and return ``-1`` on failure; return ``0`` on success. This
 is the equivalent of the Python statement ``o[i] = v``. This function *does
 not* steal a reference to *v*.

 If *v* is *NULL*, the element is deleted, however this feature is
 deprecated in favour of using :c:func:`PySequence_DelItem`.

.. c:function:: int PySequence_DelItem(PyObject *o, Py_ssize_t i)

 Delete the *i*\ th element of object *o*. Returns ``-1`` on failure. This is the
 equivalent of the Python statement ``del o[i]``.

.. c:function:: int PySequence_SetSlice(PyObject *o, Py_ssize_t i1, Py_ssize_t i2, PyObject *v)

 Assign the sequence object *v* to the slice in sequence object *o* from *i1* to
 *i2*. This is the equivalent of the Python statement ``o[i1:i2] = v``.

.. c:function:: int PySequence_DelSlice(PyObject *o, Py_ssize_t i1, Py_ssize_t i2)

 Delete the slice in sequence object *o* from *i1* to *i2*. Returns ``-1`` on
 failure. This is the equivalent of the Python statement ``del o[i1:i2]``.

.. c:function:: Py_ssize_t PySequence_Count(PyObject *o, PyObject *value)

 Return the number of occurrences of *value* in *o*, that is, return the number
 of keys for which ``o[key] == value``. On failure, return ``-1``. This is
 equivalent to the Python expression ``o.count(value)``.

.. c:function:: int PySequence_Contains(PyObject *o, PyObject *value)

 Determine if *o* contains *value*. If an item in *o* is equal to *value*,
 return ``1``, otherwise return ``0``. On error, return ``-1``. This is
 equivalent to the Python expression ``value in o``.

.. c:function:: Py_ssize_t PySequence_Index(PyObject *o, PyObject *value)

 Return the first index *i* for which ``o[i] == value``. On error, return
 ``-1``. This is equivalent to the Python expression ``o.index(value)``.

.. c:function:: PyObject* PySequence_List(PyObject *o)

 Return a list object with the same contents as the sequence or iterable *o*,
 or *NULL* on failure. The returned list is guaranteed to be new. This is
 equivalent to the Python expression ``list(o)``.

.. c:function:: PyObject* PySequence_Tuple(PyObject *o)

 .. index:: builtin: tuple

 Return a tuple object with the same contents as the sequence or iterable *o*,
 or *NULL* on failure. If *o* is a tuple, a new reference will be returned,
 otherwise a tuple will be constructed with the appropriate contents. This is
 equivalent to the Python expression ``tuple(o)``.

.. c:function:: PyObject* PySequence_Fast(PyObject *o, const char *m)

 Return the sequence or iterable *o* as a list, unless it is already a tuple or list, in
 which case *o* is returned. Use :c:func:`PySequence_Fast_GET_ITEM` to access
 the members of the result. Returns *NULL* on failure. If the object is not
 a sequence or iterable, raises :exc:`TypeError` with *m* as the message text.

.. c:function:: Py_ssize_t PySequence_Fast_GET_SIZE(PyObject *o)

 Returns the length of *o*, assuming that *o* was returned by
 :c:func:`PySequence_Fast` and that *o* is not *NULL*. The size can also be
 gotten by calling :c:func:`PySequence_Size` on *o*, but
 :c:func:`PySequence_Fast_GET_SIZE` is faster because it can assume *o* is a list
 or tuple.

.. c:function:: PyObject* PySequence_Fast_GET_ITEM(PyObject *o, Py_ssize_t i)

 Return the *i*\ th element of *o*, assuming that *o* was returned by
 :c:func:`PySequence_Fast`, *o* is not *NULL*, and that *i* is within bounds.

.. c:function:: PyObject** PySequence_Fast_ITEMS(PyObject *o)

 Return the underlying array of PyObject pointers. Assumes that *o* was returned
 by :c:func:`PySequence_Fast` and *o* is not *NULL*.

 Note, if a list gets resized, the reallocation may relocate the items array.
 So, only use the underlying array pointer in contexts where the sequence
 cannot change.

.. c:function:: PyObject* PySequence_ITEM(PyObject *o, Py_ssize_t i)

 Return the *i*\ th element of *o* or *NULL* on failure. Macro form of
 :c:func:`PySequence_GetItem` but without checking that
 :c:func:`PySequence_Check` on *o* is true and without adjustment for negative
 indices.

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