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.. highlightlang:: c .. _iterator-objects: Iterator Objects ---------------- Python provides two general-purpose iterator objects. The first, a sequence iterator, works with an arbitrary sequence supporting the :meth:`__getitem__` method. The second works with a callable object and a sentinel value, calling the callable for each item in the sequence, and ending the iteration when the sentinel value is returned. .. c:var:: PyTypeObject PySeqIter_Type Type object for iterator objects returned by :c:func:`PySeqIter_New` and the one-argument form of the :func:`iter` built-in function for built-in sequence types. .. c:function:: int PySeqIter_Check(op) Return true if the type of *op* is :c:data:`PySeqIter_Type`. .. c:function:: PyObject* PySeqIter_New(PyObject *seq) Return an iterator that works with a general sequence object, *seq*. The iteration ends when the sequence raises :exc:`IndexError` for the subscripting operation. .. c:var:: PyTypeObject PyCallIter_Type Type object for iterator objects returned by :c:func:`PyCallIter_New` and the two-argument form of the :func:`iter` built-in function. .. c:function:: int PyCallIter_Check(op) Return true if the type of *op* is :c:data:`PyCallIter_Type`. .. c:function:: PyObject* PyCallIter_New(PyObject *callable, PyObject *sentinel) Return a new iterator. The first parameter, *callable*, can be any Python callable object that can be called with no parameters; each call to it should return the next item in the iteration. When *callable* returns a value equal to *sentinel*, the iteration will be terminated.