Brett Cannon added the comment: This is actually expected because that is just how floating point works in programming (see http://en.wikipedia.org/wiki/Floating_point for all the gnarly details).
If you want exact decimal arithmetic, use the decimal module (which got significantly faster in Python 3.3):: >>> import decimal >>> decimal.Decimal('.3') - decimal.Decimal('.1') Decimal('0.2') >>> decimal.Decimal('.05') + decimal.Decimal('.01') Decimal('0.06') ---------- nosy: +brett.cannon resolution: -> invalid status: open -> closed _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue18613> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com