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18 Commits

Author SHA1 Message Date
Raymond Hettinger 75ccea3777 SF patch #1020188: Use Py_CLEAR where necessary to avoid crashes 
(Contributed by Dima Dorfman)
 2004-09-01 07:02:44 +00:00
Raymond Hettinger d2afee47b1 Fix docstring typo. 2004-08-25 19:42:12 +00:00
Raymond Hettinger 7892b1c651 * Add unittests for iterators that report their length 
* Document the differences between them
* Fix corner cases covered by the unittests
* Use Py_RETURN_NONE where possible for dictionaries
 2004-04-12 18:10:01 +00:00
Raymond Hettinger ef9bf4031a Tidied up the implementations of reversed (including the custom ones 
for xrange and list objects).

* list.__reversed__ now checks the length of the sequence object before
  calling PyList_GET_ITEM() because the mutable could have changed length.

* all three implementations are now tranparent with respect to length and
  maintain the invariant len(it) == len(list(it)) even when the underlying
  sequence mutates.

* __builtin__.reversed() now frees the underlying sequence as soon
  as the iterator is exhausted.

* the code paths were rearranged so that the most common paths
  do not require a jump.
 2004-03-10 10:10:42 +00:00
Raymond Hettinger d2c36261a2 Eliminate the double reverse option. It's only use case 
was academic and it was potentially confusing to use.
 2004-03-10 08:32:47 +00:00
Raymond Hettinger 029dba5a40 Make reversed() transparent with respect to length. 2004-02-10 09:33:39 +00:00
Raymond Hettinger 06353f76be Let reversed() work with itself. 2004-02-08 10:49:42 +00:00
Raymond Hettinger c058fd14a9 * Fix ref counting in extend() and extendleft(). 
* Let deques support reversed().
 2004-02-07 02:45:22 +00:00
Raymond Hettinger 1021c44b41 Optimize reversed(list) using a custom iterator. 2003-11-07 15:38:09 +00:00
Raymond Hettinger 85c20a41df Implement and apply PEP 322, reverse iteration 2003-11-06 14:06:48 +00:00
Raymond Hettinger 54a831bef7 Use PyTuple_Pack() to simplify enumerate(). 2003-11-02 05:37:44 +00:00
Raymond Hettinger e8b0f0461b * Beefed-up tests 
* Allow tuple re-use
* Call tp_iternext directly
 2003-05-28 14:05:34 +00:00
Jeremy Hylton fbbe34789e Add a useful docstring to enumerate. 2003-04-21 20:26:25 +00:00
Raymond Hettinger 1da1dbf458 Renamed PyObject_GenericGetIter to PyObject_SelfIter 
to more accurately describe what the function does.

Suggested by Thomas Wouters.
 2003-03-17 19:46:11 +00:00
Raymond Hettinger 0153826964 Created PyObject_GenericGetIter(). 
Factors out the common case of returning self.
 2003-03-17 08:24:35 +00:00
Guido van Rossum ca5ed5b875 Remove the next() method -- one is supplied automatically by 
PyType_Ready() because the tp_iternext slot is set (fortunately,
because using the tp_iternext implementation for the the next()
implementation is buggy).  Also changed the allocation order in
enum_next() so that the underlying iterator is only moved ahead when
we have successfully allocated the result tuple and index.
 2002-07-16 21:02:42 +00:00
Martin v. Löwis 14f8b4cfcb Patch #568124: Add doc string macros. 2002-06-13 20:33:02 +00:00
Guido van Rossum 7dab2426ca - New builtin function enumerate(x), from PEP 279. Example: 
enumerate("abc") is an iterator returning (0,"a"), (1,"b"), (2,"c").
  The argument can be an arbitrary iterable object.
 2002-04-26 19:40:56 +00:00