Author: georg.brandl Date: Sat Jul 31 10:00:13 2010 New Revision: 83314 Log: #2986: document SequenceMatcher heuristic. Modified: python/branches/release26-maint/Doc/library/difflib.rst Modified: python/branches/release26-maint/Doc/library/difflib.rst ============================================================================== --- python/branches/release26-maint/Doc/library/difflib.rst (original) +++ python/branches/release26-maint/Doc/library/difflib.rst Sat Jul 31 10:00:13 2010 @@ -37,6 +37,11 @@ complicated way on how many elements the sequences have in common; best case time is linear. + **Heuristic:** To speed-up matching, items that appear more than 1% of the + time in sequences of at least 200 items are treated as junk. This has the + unfortunate side-effect of giving bad results for sequences constructed from + a small set of items. An option to turn off the heuristic will be added to a + future version. .. class:: Differ