Iterator Objects¶

Python provides two general-purpose iterator objects. The first, a sequence iterator, works with an arbitrary sequence supporting the __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.

PyTypeObject PySeqIter_Type¶
Part of the Stable ABI.

Type object for iterator objects returned by PySeqIter_New() and the one-argument form of the iter() built-in function for built-in sequence types.

int PySeqIter_Check(PyObject *op)¶

Return true if the type of op is PySeqIter_Type. This function always succeeds.

PyObject *PySeqIter_New(PyObject *seq)¶
Return value: New reference. Part of the Stable ABI.

Return an iterator that works with a general sequence object, seq. The iteration ends when the sequence raises IndexError for the subscripting operation.

PyTypeObject PyCallIter_Type¶
Part of the Stable ABI.

Type object for iterator objects returned by PyCallIter_New() and the two-argument form of the iter() built-in function.

int PyCallIter_Check(PyObject *op)¶

Return true if the type of op is PyCallIter_Type. This function always succeeds.

PyObject *PyCallIter_New(PyObject *callable, PyObject *sentinel)¶
Return value: New reference. Part of the Stable ABI.

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.

Range Objects¶

PyTypeObject PyRange_Type¶
Part of the Stable ABI.

The type object for range objects.

int PyRange_Check(PyObject *o)¶

Return true if the object o is an instance of a range object. This function always succeeds.

Builtin Iterator Types¶

These are built-in iteration types that are included in Python’s C API, but provide no additional functions. They are here for completeness.

C type

Python type

PyTypeObject PyEnum_Type¶
Part of the Stable ABI.

enumerate

PyTypeObject PyFilter_Type¶
Part of the Stable ABI.

filter

PyTypeObject PyMap_Type¶
Part of the Stable ABI.

map

PyTypeObject PyReversed_Type¶
Part of the Stable ABI.

reversed

PyTypeObject PyZip_Type¶
Part of the Stable ABI.

zip

Other Iterator Objects¶

PyTypeObject PyByteArrayIter_Type¶
Part of the Stable ABI.
PyTypeObject PyBytesIter_Type¶
Part of the Stable ABI.
PyTypeObject PyListIter_Type¶
Part of the Stable ABI.
PyTypeObject PyListRevIter_Type¶
Part of the Stable ABI.
PyTypeObject PySetIter_Type¶
Part of the Stable ABI.
PyTypeObject PyTupleIter_Type¶
Part of the Stable ABI.
PyTypeObject PyRangeIter_Type¶
Part of the Stable ABI.
PyTypeObject PyLongRangeIter_Type¶
Part of the Stable ABI.
PyTypeObject PyDictIterKey_Type¶
Part of the Stable ABI.
PyTypeObject PyDictRevIterKey_Type¶
Part of the Stable ABI since version 3.8.
PyTypeObject PyDictIterValue_Type¶
Part of the Stable ABI.
PyTypeObject PyDictRevIterValue_Type¶
Part of the Stable ABI since version 3.8.
PyTypeObject PyDictIterItem_Type¶
Part of the Stable ABI.
PyTypeObject PyDictRevIterItem_Type¶
Part of the Stable ABI since version 3.8.
PyTypeObject PyODictIter_Type¶

Type objects for iterators of various built-in objects.

Do not create instances of these directly; prefer calling PyObject_GetIter() instead.

Note that there is no guarantee that a given built-in type uses a given iterator type. For example, iterating over range will use one of two iterator types depending on the size of the range. Other types may start using a similar scheme in the future, without warning.