Commit Graph

17 Commits

Author SHA1 Message Date
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 855d9a985b Plug a leak and beef-up test coverage. 2004-09-28 00:03:54 +00:00
Tim Peters 27f883687b Whitespace normalization. 2004-07-08 04:22:35 +00:00
Neal Norwitz d7be118626 Exercise some error conditions 2004-07-08 01:56:46 +00:00
Raymond Hettinger aefde435ef Reverse argument order for nsmallest() and nlargest().
Reads better when the iterable is a generator expression.
2004-06-15 23:53:35 +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 bce036b49e Convert test_heapq.py to unittests. 2004-06-10 05:07:18 +00:00
Raymond Hettinger 33ecffb65a SF patch #969791: Add nlargest() and nsmallest() to heapq. 2004-06-10 05:03:17 +00:00
Raymond Hettinger 065c06a622 Add another test which exercises the whole suite with a
heapsort and verifies the result against list.sort().
2002-12-07 10:33:42 +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 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
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
Tim Peters d2cf1ab0e2 check_invariant(): Use the same child->parent "formula" used by heapq.py. 2002-08-02 19:41:54 +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 0b19178736 Adding the heap queue algorithm, per discussion in python-dev last
week.
2002-08-02 18:29:53 +00:00