Bugs item #1778207, was opened at 2007-08-20 16:20 Message generated for change (Tracker Item Submitted) made by Item Submitter You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1778207&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 2.4 Status: Open Resolution: None Priority: 5 Private: No Submitted By: Jim Hurlburt (jim_hurlburt) Assigned to: Nobody/Anonymous (nobody) Summary: rounding inconsisntency using string formatting Initial Comment: Sirs: Using python to generate a text file for transfer of data between systems, I seem to be getting inconsistent rounding results using a text formatting string Python 2.4.3 (#69, Mar 29 2006, 17:35:34) [MSC v.1310 32 bit (Intel)] on win32 print "%9.4f" % (229.0 * .325,) -> 74.4250 correct print "%9.2f" % (round(74.425, 2),) -> 74.43 correct print "%9.2f" % (74.425,) -> 74.42 wrong print "%9.2f" % (167.255,) -> 167.26 correct print "%9.2f" % (167.2551,) -> 167.26 correct print "%9.2f" % (167.2549,) -> 167.25 correct It appears as if the string formatting code is a bit flakey. Perhaps working in binary with too small a precision? For a bit I thought it might be "Round even up, odd down at the .005 break, but that doesn't appear to be the case. Now that I know it's there, I can do a workaround. Seems as if it deserves a fix or at least a document notation of the problem. Thanks in advance, Jim Hurlburt Atrium Windows and Doors Yakima, WA ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1778207&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
