Does python have built-in linkedList data structure?

Question

Does anyone know if Python (maybe 2.7) has a built-in linkedList data structure? I know the queue is implemented using list, and there is no stack (there is LIFO queue).

Answer 1

Yes, Python's collections module provides C-implemented deque object, which uses linked list of BLOCKs internally.

typedef struct BLOCK {
    struct BLOCK *leftlink;
    PyObject *data[BLOCKLEN];
    struct BLOCK *rightlink;
} block;

typedef struct {
    PyObject_VAR_HEAD
    block *leftblock;
    block *rightblock;
    Py_ssize_t leftindex;       /* 0 <= leftindex < BLOCKLEN */
    Py_ssize_t rightindex;      /* 0 <= rightindex < BLOCKLEN */
    size_t state;               /* incremented whenever the indices move */
    Py_ssize_t maxlen;          /* maxlen is -1 for unbounded deques */
    PyObject *weakreflist;
} dequeobject;

static PyTypeObject deque_type;