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38 Commits

Author SHA1 Message Date
Raymond Hettinger d263bd8d4a Issue 4790: Eliminate unnecessary work from heapq's nlargest() and nsmallest() 
functions for the common case where no key function is specified.
 2008-12-31 04:18:44 +00:00
Raymond Hettinger 6d7702ecd1 Implement heapq in terms of less-than (to match list.sort()). 2008-05-31 03:24:31 +00:00
Raymond Hettinger 83aa6a3b1a Simplify the nlargest() code using heappushpop(). 2008-03-13 19:33:34 +00:00
Raymond Hettinger 53bdf09343 Issue 2274: Add heapq.heappushpop(). 2008-03-13 19:03:51 +00:00
Raymond Hettinger 3035d2397f Docstring nit. 2007-02-28 18:27:41 +00:00
Raymond Hettinger cbac8ce5b0 Fixup docstrings for merge(). 2007-02-19 18:15:04 +00:00
Raymond Hettinger 45eb0f1419 Use C heapreplace() instead of slower _siftup() in pure python. 2007-02-19 06:59:32 +00:00
Raymond Hettinger 54da9819cc Add tie-breaker count to preserve sort stability. 2007-02-19 05:28:28 +00:00
Raymond Hettinger 00166c5532 Add merge() function to heapq. 2007-02-19 04:08:43 +00:00
Raymond Hettinger 769a40a1d0 Fix stability of heapq's nlargest() and nsmallest(). 2007-01-04 17:53:34 +00:00
Raymond Hettinger 4901a1f267 Add key= argument to heapq.nsmallest() and heapq.nlargest(). 2004-12-02 08:59:14 +00:00
Raymond Hettinger e1defa4175 Fix argument order in pure python version of nsmallest() and nlargest(). 2004-11-29 05:54:48 +00:00
Raymond Hettinger 8158e84930 Fix erroneous docstring comment. 2004-09-06 07:04:09 +00:00
Raymond Hettinger 28224f897a Improve the documented advice on how to best use heapq.heapreplace(). 2004-06-20 09:07:53 +00:00
Raymond Hettinger 2e3dfaf707 Install C version of heapq.nsmallest(). 2004-06-13 05:26:33 +00:00
Raymond Hettinger b25aa36f83 Improve the memory performance and speed of heapq.nsmallest() by using 
an alternate algorithm when the number of selected items is small
relative to the full iterable.
 2004-06-12 08:33:36 +00:00
Raymond Hettinger 33ecffb65a SF patch #969791: Add nlargest() and nsmallest() to heapq. 2004-06-10 05:03:17 +00:00
Raymond Hettinger c46cb2a1a9 * Restore the pure python version of heapq.py. 
* Mark the C version as private and only use when available.
 2004-04-19 19:06:21 +00:00
Raymond Hettinger b3af1813eb Convert heapq.py to a C implementation. 2003-11-08 10:24:38 +00:00
Raymond Hettinger 85c20a41df Implement and apply PEP 322, reverse iteration 2003-11-06 14:06:48 +00:00
Walter Dörwald f0dfc7ac5c Fix a bunch of typos in documentation, docstrings and comments. 
(From SF patch #810751)
 2003-10-20 14:01:56 +00:00
Fred Drake f2928eb017 Fix typo in comment. 2002-11-13 14:38:17 +00:00
Raymond Hettinger a853cc6647 Added __all__. 2002-10-30 06:15:53 +00:00
Tim Peters 5f7617b5f6 Fixed misspelling in comment. 2002-08-11 18:28:09 +00:00
Tim Peters 469cdad822 Whitespace normalization. 2002-08-08 20:19:19 +00:00
Guido van Rossum 3c8dd0c6e7 Simplify heapreplace() -- there's no need for an explicit test for 
empty heap, since heap[0] raises the appropriate IndexError already.
 2002-08-07 18:58:11 +00:00
Tim Peters 6681de2455 _siftup(): __le__ is now the only comparison operator used on array 
elements.
 2002-08-03 19:20:16 +00:00
Tim Peters 0cd53a6c37 Added new heapreplace(heap, item) function, to pop (and return) the 
currently-smallest value, and add item, in one gulp.  See the second
N-Best algorithm in the test suite for a natural use.
 2002-08-03 10:10:10 +00:00
Tim Peters 657fe38241 Large code rearrangement to use better algorithms, in the sense of needing 
substantially fewer array-element compares.  This is best practice as of
Kntuh Volume 3 Ed 2, and the code is actually simpler this way (although
the key idea may be counter-intuitive at first glance!  breaking out of
a loop early loses when it costs more to try to get out early than getting
out early saves).
Also added a comment block explaining the difference and giving some real
counts; demonstrating that heapify() is more efficient than repeated
heappush(); and emphasizing the obvious point thatlist.sort() is more
efficient if what you really want to do is sort.
 2002-08-03 09:56:52 +00:00
Tim Peters aa7d24319e Minor fiddling, including a simple class to implement a heap iterator 
in the test file.  I have docs for heapq.heapify ready to check in, but
Jack appears to have left behind a stale lock in the Doc/lib directory.
 2002-08-03 02:11:26 +00:00
Guido van Rossum fbb299226d Augment credits. 2002-08-02 22:01:37 +00:00
Tim Peters 28c25527c2 Hmm! I thought I checked this in before! Oh well. 
Added new heapify() function, which transforms an arbitrary list into a
heap in linear time; that's a fundamental tool for using heaps in real
life <wink>.

Added heapyify() test.  Added a "less naive" N-best algorithm to the test
suite, and noted that this could actually go much faster (building on
heapify()) if we had max-heaps instead of min-heaps (the iterative method
is appropriate when all the data isn't known in advance, but when it is
known in advance the tradeoffs get murkier).
 2002-08-02 21:48:06 +00:00
Guido van Rossum 4b48d6b37c Add a PEP-263-style encoding turd^H^H^H^Hdeclaration, because there's 
a c-cedilla in one of the docstrings.
 2002-08-02 20:23:56 +00:00
Tim Peters 62abc2f6ce heappop(): Added comments; simplified and sped the code. 2002-08-02 20:09:14 +00:00
Tim Peters a0b3a00bc5 heappop(): Use "while True" instead of "while 1". 2002-08-02 19:45:37 +00:00
Tim Peters d9ea39db84 Don't use true division where int division was intended. For that matter, 
don't use division at all.
 2002-08-02 19:16:44 +00:00
Guido van Rossum 37c3b2788b Add Kevin O'Connor, author of the heapq code. 2002-08-02 16:50:58 +00:00
Guido van Rossum 0a82438859 Adding the heap queue algorithm, per discussion in python-dev last 
week.
 2002-08-02 16:44:32 +00:00