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Mondo changes to the iterator stuff, without changing how Python code

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sees it (test_iter.py is unchanged).

- Added a tp_iternext slot, which calls the iterator's next() method;
  this is much faster for built-in iterators over built-in types
  such as lists and dicts, speeding up pybench's ForLoop with about
  25% compared to Python 2.1.  (Now there's a good argument for
  iterators. ;-)

- Renamed the built-in sequence iterator SeqIter, affecting the C API
  functions for it.  (This frees up the PyIter prefix for generic
  iterator operations.)

- Added PyIter_Check(obj), which checks that obj's type has a
  tp_iternext slot and that the proper feature flag is set.

- Added PyIter_Next(obj) which calls the tp_iternext slot.  It has a
  somewhat complex return condition due to the need for speed: when it
  returns NULL, it may not have set an exception condition, meaning
  the iterator is exhausted; when the exception StopIteration is set
  (or a derived exception class), it means the same thing; any other
  exception means some other error occurred.
This commit is contained in:
Guido van Rossum 2001-04-23 14:08:49 +00:00
parent 8b3d6ca3df
commit 213c7a6aa5
9 changed files with 188 additions and 64 deletions
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6
Include/iterobject.h
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@ -1,10 +1,10 @@
/* Iterators (the basic kind, over a sequence) */
extern DL_IMPORT(PyTypeObject) PyIter_Type;
extern DL_IMPORT(PyTypeObject) PySeqIter_Type;
#define PyIter_Check(op) ((op)->ob_type == &PyIter_Type)
#define PySeqIter_Check(op) ((op)->ob_type == &PySeqIter_Type)
extern DL_IMPORT(PyObject *) PyIter_New(PyObject *);
extern DL_IMPORT(PyObject *) PySeqIter_New(PyObject *);
extern DL_IMPORT(PyTypeObject) PyCallIter_Type;