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54 Commits

Author SHA1 Message Date
Raymond Hettinger 9d63837e9b Make sure the itertools filter functions give the same performance for func=bool as func=None. 2008-02-25 22:42:32 +00:00
Raymond Hettinger 73d7963242 Improve the implementation of itertools.product() 
* Fix-up issues pointed-out by Neal Norwitz.
* Add extensive comments.
* The lz->result variable is now a tuple instead of a list.
* Use fast macro getitem/setitem calls so most code is in-line.
* Re-use the result tuple if available (modify in-place instead of copy).
 2008-02-23 02:20:41 +00:00
Raymond Hettinger 50986cc45b First draft for itertools.product(). Docs and other updates forthcoming. 2008-02-22 03:16:42 +00:00
Raymond Hettinger 473170908e Make starmap() match its pure python definition and accept any itertable input (not just tuples). 2008-01-17 03:02:14 +00:00
Raymond Hettinger 3a0de08d54 Fix test of count.__repr__() to ignore the 'L' if the count is a long 2007-10-12 17:53:11 +00:00
Raymond Hettinger 50e90e265f itertools.count() no longer limited to sys.maxint. 2007-10-04 00:20:27 +00:00
Kristján Valur Jónsson 170eee9d6a Fix those parts in the testsuite that assumed that sys.maxint would cause overflow on x64. Now the testsuite is well behaved on that platform. 2007-05-03 20:09:56 +00:00
Tim Peters ea5962f86e Whitespace normalization. 2007-03-12 18:07:52 +00:00
Raymond Hettinger d36862cf78 Add itertools.izip_longest(). 2007-02-21 05:20:38 +00:00
Raymond Hettinger 6d121f168c Do not let overflows in enumerate() and count() pass silently. 2007-02-08 00:07:32 +00:00
Georg Brandl b84c13792d Bug #1486663: don't reject keyword arguments for subclasses of builtin 
types.
 2007-01-21 10:28:43 +00:00
Jack Diederich 36234e8f66 * regression bug, count_next was coercing a Py_ssize_t to an unsigned Py_size_t 
which breaks negative counts
* added test for negative numbers
will backport to 2.5.1
 2006-09-21 17:50:26 +00:00
Neal Norwitz 69e8897505 Bug #1550714: fix SystemError from itertools.tee on negative value for n. 
Needs backport to 2.5.1 and earlier.
 2006-09-02 02:58:13 +00:00
Armin Rigo a3f092751a ("Forward-port" of r46506) 
Remove various dependencies on dictionary order in the standard library
tests, and one (clearly an oversight, potentially critical) in the
standard library itself - base64.py.

Remaining open issues:
 * test_extcall is an output test, messy to make robust
 * tarfile.py has a potential bug here, but I'm not familiar
   enough with this code.  Filed in as SF bug #1496501.
 * urllib2.HTTPPasswordMgr() returns a random result if there is more
   than one matching root path.  I'm asking python-dev for
   clarification...
 2006-05-28 19:13:17 +00:00
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