Tuple Objects

PyTupleObject

This subtype of PyObject represents a Python tuple object.

PyTypeObject PyTuple_Type

This instance of PyTypeObject represents the Python tuple type; it is the same object as tuple in the Python layer.

int PyTuple_Check(PyObject *p)

Return true if p is a tuple object or an instance of a subtype of the tuple type. This function always succeeds.

int PyTuple_CheckExact(PyObject *p)

Return true if p is a tuple object, but not an instance of a subtype of the tuple type. This function always succeeds.

PyObject* PyTuple_New(Py_ssize_t len)

Return value: New reference.

Return a new tuple object of size len, or NULL on failure.

PyObject* PyTuple_Pack(Py_ssize_t n, ...)

Return value: New reference.

Return a new tuple object of size n, or NULL on failure. The tuple values are initialized to the subsequent n C arguments pointing to Python objects. PyTuple_Pack(2, a, b) is equivalent to Py_BuildValue("(OO)", a, b).

Py_ssize_t PyTuple_Size(PyObject *p)

Take a pointer to a tuple object, and return the size of that tuple.

Py_ssize_t PyTuple_GET_SIZE(PyObject *p)

Return the size of the tuple p, which must be non-NULL and point to a tuple; no error checking is performed.

PyObject* PyTuple_GetItem(PyObject *p, Py_ssize_t pos)

Return value: Borrowed reference.

Return the object at position pos in the tuple pointed to by p. If pos is out of bounds, return NULL and set an IndexError exception.

PyObject* PyTuple_GET_ITEM(PyObject *p, Py_ssize_t pos)

Return value: Borrowed reference.

Like PyTuple_GetItem(), but does no checking of its arguments.

PyObject* PyTuple_GetSlice(PyObject *p, Py_ssize_t low, Py_ssize_t high)

Return value: New reference.

Return the slice of the tuple pointed to by p between low and high, or NULL on failure. This is the equivalent of the Python expression p[low:high]. Indexing from the end of the list is not supported.

int PyTuple_SetItem(PyObject *p, Py_ssize_t pos, PyObject *o)

Insert a reference to object o at position pos of the tuple pointed to by p. Return 0 on success. If pos is out of bounds, return -1 and set an IndexError exception.

Note

This function “steals” a reference to o and discards a reference to an item already in the tuple at the affected position.

void PyTuple_SET_ITEM(PyObject *p, Py_ssize_t pos, PyObject *o)

Like PyTuple_SetItem(), but does no error checking, and should only be used to fill in brand new tuples.

Note

This macro “steals” a reference to o, and, unlike PyTuple_SetItem(), does not discard a reference to any item that is being replaced; any reference in the tuple at position pos will be leaked.

int _PyTuple_Resize(PyObject **p, Py_ssize_t newsize)

Can be used to resize a tuple. newsize will be the new length of the tuple. Because tuples are supposed to be immutable, this should only be used if there is only one reference to the object. Do not use this if the tuple may already be known to some other part of the code. The tuple will always grow or shrink at the end. Think of this as destroying the old tuple and creating a new one, only more efficiently. Returns 0 on success. Client code should never assume that the resulting value of *p will be the same as before calling this function. If the object referenced by *p is replaced, the original *p is destroyed. On failure, returns -1 and sets *p to NULL, and raises MemoryError or SystemError.