openerp-india team mailing list archive

["Xavier \(Open ERP\)" <882036@xxxxxxxxxxxxxxxxxx>]

> The round issue is a python bug (not a OpenERP bug) ?! Or not ?

It's neither and both, it's an inaccuracy issue with the way floating-
point numbers are stored[0], leading to a number of problems [1] [2]
when trying to perform precise manipulation (including rounding) of
floating-point numbers (floats and doubles). Lorenzo also nicely
outlined the issues in the message he linked.

The behavior is deterministic, but that does not make it any easier to
handle.

[0] http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html
[1] http://docs.python.org/tutorial/floatingpoint.html
[2] http://www.lahey.com/float.htm

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https://bugs.launchpad.net/bugs/882036

Title:
  rounding error

Status in OpenERP Server:
  New

Bug description:
  Concerns 6.0 and trunk.
  If you define a precision of 0.01, the rounding of 0.125 must be 0.13 and not 0.12. The error is in the call of the format string "%.2f"%val which introduces a mathematical error. The round function must be called to apply the correct rounding before formatting the string. It should be:
  "%.2f"%round(val*100)/100
  Fix class digits_change of class float in the server. BUT fix also the gtk client AND web client as they all have that error (I let you find the right line)

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