Set Objects

Working with Python set and frozenset types

Overview

Sets are unordered collections of unique hashable objects.

Creating Sets

PyObject* PySet_New(PyObject *iterable)
PyObject* PyFrozenSet_New(PyObject *iterable)

Example:

PyObject *set = PySet_New(NULL);  // Empty set
return set;

Set Operations

int PySet_Add(PyObject *set, PyObject *key)
int PySet_Discard(PyObject *set, PyObject *key)
int PySet_Contains(PyObject *anyset, PyObject *key)
Py_ssize_t PySet_Size(PyObject *anyset)

Example:

PyObject *item = PyLong_FromLong(42);
PySet_Add(set, item);
Py_DECREF(item);

if (PySet_Contains(set, item)) {
    printf("Set contains 42\n");
}

Set Methods

PyObject* PySet_Pop(PyObject *set)
void PySet_Clear(PyObject *set)

See Also

• Dictionary Objects
• Object Protocol