Bugs item #1544762, was opened at 2006-08-22 17:51 Message generated for change (Comment added) made by charlesmerriam You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1544762&group_id=5470
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Python Interpreter Core Group: Python 2.5 Status: Open Resolution: None Priority: 5 Submitted By: Alex Martelli (aleax) Assigned to: Nobody/Anonymous (nobody) Summary: x!=y and [x]==[y] (!) Initial Comment: Easy to obtain the weird behavior in the summary (in 2.5rc1 and earlier): >>> inf=1e9999 >>> x = y = inf/inf >>> x!=y and [x]==[y] True I propose to fix it by ensuring that lists (and tuples etc) compare their items with exactly the same logic as the == and != operators use. Alex ([EMAIL PROTECTED]) ---------------------------------------------------------------------- Comment By: CharlesMerriam (charlesmerriam) Date: 2006-08-23 08:46 Message: Logged In: YES user_id=1581732 FYI: while not directly related, NaN comparisons keep making trouble. Per bug 1514428, python makes the mistake that inf > Nan should return false, just like Nan < inf. ---------------------------------------------------------------------- Comment By: CharlesMerriam (charlesmerriam) Date: 2006-08-22 22:49 Message: Logged In: YES user_id=1581732 This appears to be a special oddity of NaN, which is a member of the set of "Things That Do Not Equal Themselves". 1. Are there any more members of this set? 2. Does this mean that any complex data type containing an integer is no a member of this set? 3. Is it odd that, say, a user's StatisticsArray will not equal itself if some statistic in the array is Nan? ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1544762&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
