Commit Graph

90 Commits

Author SHA1 Message Date
Raymond Hettinger 6b27cda643 Convert iterator __len__() methods to a private API. 2005-09-24 21:23:05 +00:00
Raymond Hettinger fdf3bd6630 SF patch #1171417: bug fix for islice() in docs 2005-03-27 20:11:44 +00:00
Raymond Hettinger f77d0334f3 Revised the itertools quantifier recipes to match the performance of the
new builtins.
2005-03-11 22:17:30 +00:00
Raymond Hettinger b2594050ea Added optional None arguments to itertools.islice(). 2004-12-05 09:25:51 +00:00
Raymond Hettinger a9f6092904 Fix and test weak referencing of itertools.tee objects. 2004-10-17 16:40:14 +00:00
Raymond Hettinger ff5dc0ee77 Improve test coverage. 2004-09-29 11:40:50 +00:00
Raymond Hettinger 4cda01e260 * Increase test coverage.
* Have groupby() be careful about decreffing structure members.
2004-09-28 04:45:28 +00:00
Raymond Hettinger ffdb8bb99c Use floor division operator. 2004-09-27 15:29:05 +00:00
Raymond Hettinger 4533f1fb7f Improve three recipes in the itertools docs. 2004-09-23 07:27:39 +00:00
Tim Peters beb7c0c434 test_sf_950057's gen1() used an assert statement, which caused the test
to fail when running with -O.  Changed to raise AssertionError instead.
2004-07-18 17:34:03 +00:00
Raymond Hettinger 9d7c870c6d SF #950057: itertools.chain doesn't "process" exceptions as they occur
Both cycle() and chain() were handling exceptions only when switching
input sources.  The patch makes the handle more immediate.

Will backport.
2004-05-08 19:49:42 +00:00
Raymond Hettinger 5cab2e3a88 Give itertools.repeat() a length method. 2004-02-10 09:25:40 +00:00
Raymond Hettinger 734fb5724f Add a Guido inspired example for groupby(). 2004-01-20 20:04:40 +00:00
Raymond Hettinger 64958a15d7 Guido grants a Christmas wish:
sorted() becomes a regular function instead of a classmethod.
2003-12-17 20:43:33 +00:00
Raymond Hettinger d25c1c6351 Implement itertools.groupby()
Original idea by Guido van Rossum.
Idea for skipable inner iterators by Raymond Hettinger.
Idea for argument order and identity function default by Alex Martelli.
Implementation by Hye-Shik Chang (with tweaks by Raymond Hettinger).
2003-12-06 16:23:06 +00:00
Raymond Hettinger ad983e79d6 Improve the implementation of itertools.tee().
Formerly, underlying queue was implemented in terms of two lists.  The
new queue is a series of singly-linked fixed length lists.

The new implementation runs much faster, supports multi-way tees, and
allows tees of tees without additional memory costs.

The root ideas for this structure were contributed by Andrew Koenig
and Guido van Rossum.
2003-11-12 14:32:26 +00:00
Raymond Hettinger d591f666de Replace the window() example with pairwise() which demonstrates tee(). 2003-10-26 15:34:50 +00:00
Raymond Hettinger f0c5aec85f Minor improvements to itertools.tee():
* tee object is no longer subclassable
* independent iterators renamed to "itertools.tee_iterator"
* fixed doc string typo and added entry in the module doc string
2003-10-26 14:25:56 +00:00
Raymond Hettinger 6a5b027742 Added itertools.tee()
It works like the pure python verion except:
* it stops storing data after of the iterators gets deallocated
* the data queue is implemented with two stacks instead of one dictionary.
2003-10-24 08:45:23 +00:00
Raymond Hettinger dbe3d280e7 Adopt Christian Stork's suggested argument order for the logic quantifiers.
Adopt Jeremy Fincher's suggested function name, "any", instead of "some".
2003-10-05 16:47:36 +00:00
Raymond Hettinger 42a61ed277 Simplify doctest of tee(). 2003-09-13 01:01:34 +00:00
Raymond Hettinger a098b33c93 Add an example to address a common question of how to split iterators. 2003-09-08 23:58:40 +00:00
Raymond Hettinger a56f6b6600 SF bug #793826: using itertools.izip to mutate tuples
Avoid Armin Rigo's dastardly exercise in re-entrancy.
2003-08-29 23:09:58 +00:00
Raymond Hettinger b5a420883c Modified itertools.izip() to match the behavior of __builtin__.zip()
which can now take zero arguments.
2003-08-08 05:10:41 +00:00
Raymond Hettinger 77fe69bd08 Re-sync doc tests with the doc updates. 2003-08-08 04:33:19 +00:00
Raymond Hettinger 0242070d04 More tests
* Test with infinite inputs (using take() on the output)
* Test whether GC can find and eliminate cycles.
2003-06-29 20:36:23 +00:00
Raymond Hettinger 3567a876c7 Add take() to examples. Tighten the islice() example 2003-06-28 05:44:36 +00:00
Raymond Hettinger befa37dd05 Minor updates:
* Updated comment on design of imap()
* Added untraversed object in izip() structure
* Replaced the pairwise() example with a more general window() example
2003-06-18 19:25:37 +00:00
Raymond Hettinger f0fa1c03a0 Test ability to handle various type of iterators. 2003-05-29 07:18:57 +00:00
Raymond Hettinger 929f06c570 Minor cleanups. 2003-05-16 23:16:36 +00:00
Raymond Hettinger 7c2bb5bc57 * Added a substantial number of edge case and argument tests for
the itertoolsmodule.
* Taught itertools.repeat(obj, n) to treat negative repeat counts as
  zero.  This behavior matches that for sequences and prevents
  infinite loops.
2003-05-03 05:59:48 +00:00
Raymond Hettinger 8fd3f871f3 Add StopIteration tests.
Simplify test_main().
2003-05-02 22:38:07 +00:00
Raymond Hettinger 341deb74e7 The previous made the stop argument optional.
It is better to be explicit and just allow stop to be None.
2003-05-02 19:44:20 +00:00
Raymond Hettinger 14ef54cd83 SF bug #730685: itertools.islice stop argument is not optional
* itertools.islice() stop argument did not perform as documented.
* beefed-up test suite
2003-05-02 19:04:37 +00:00
Walter Dörwald 21d3a32b99 Combine the functionality of test_support.run_unittest()
and test_support.run_classtests() into run_unittest()
and use it wherever possible.

Also don't use "from test.test_support import ...", but
"from test import test_support" in a few spots.

From SF patch #662807.
2003-05-01 17:45:56 +00:00
Raymond Hettinger 61fe64d5de User requested changes to the itertools module.
Subsumed times() into repeat().
Added cycle() and chain().
2003-02-23 04:40:07 +00:00
Raymond Hettinger 60eca9331a C Code:
* Removed the ifilter flag wart by splitting it into two simpler functions.
* Fixed comment tabbing in C code.
* Factored module start-up code into a loop.

Documentation:
* Re-wrote introduction.
* Addede examples for quantifiers.
* Simplified python equivalent for islice().
* Documented split of ifilter().

Sets.py:
* Replace old ifilter() usage with new.
2003-02-09 06:40:58 +00:00
Raymond Hettinger 2012f174ea SF bug #681003: itertools issues
* Fixed typo in exception message for times()
* Filled in missing times_traverse()
* Document reasons that imap() did not adopt a None fill-in feature
* Document that count(sys.maxint) will wrap-around on overflow
* Add overflow test to islice()
* Check that starmap()'s argument returns a tuple
* Verify that imap()'s tuple re-use is safe
* Make a similar tuple re-use (with safety check) for izip()
2003-02-07 05:32:58 +00:00
Raymond Hettinger 874d9bcbe5 Neaten ref count test. 2003-02-01 02:33:45 +00:00
Raymond Hettinger 96ef8115dd Move itertools module from the sandbox and into production. 2003-02-01 00:10:11 +00:00