I&#x27;ve seen quite a bit when porting a statistical library that used Python 2&#x27;s default floor&#x2F;int division behavior for quite a few operations.<p>Sometimes, though, the <i>2</i> version had bugs because of this behavior. So, the bugs were both subtle and bi-directional. I definitely fault Python 2 for allowing that practice, and am glad we&#x27;re now using Python 3.