from cpython.tuple cimport (

PyTuple_New,

# Return value: New reference.

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

PyTuple_SET_ITEM,

# Like PyTuple_SetItem(), but does no error checking, and should

# only be used to fill in brand new tuples. Note: This function

# ``steals'' a reference to o.

)

from cpython.ref cimport (

Py_INCREF

# void Py_INCREF(object o)

# Increment the reference count for object o. The object must not

# be NULL; if you aren't sure that it isn't NULL, use

# Py_XINCREF().

)

cdef inline tuple tuple_new(Py_ssize_t n):

"""Allocate a new tuple object"""

return PyTuple_New(n)

cdef inline void tuple_set(tuple tup, Py_ssize_t idx, object item):

"""Insert new object into tuple. No item must have been set yet."""

# PyTuple_SET_ITEM steals a reference, so we need to INCREF

Py_INCREF(item)

PyTuple_SET_ITEM(tup, idx, item)