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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.
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