Here's the question you clicked on:
seannn11
>>> print(0.6//0.2) 2.0 WHY?!?
It's because of the way floats are stored internally. Because a mathematical float can have infinite precision, but, in real life, there's only so much memory to store one in, you get rounding errors. The expression (0.6/0.2), single slash, actually evaluates to 2.9999999999999996, not 3.0 as you'd expect. You are also using the floor division operator I think so that's where it'll be going wrong. The swapped the operators round between Python2 and Python3, so what / or // do are the opposite in each series.
how did u know it evaluated to 2.99999999999996
It is explained here http://docs.python.org/tutorial/floatingpoint.html
@seannn11 I just evaluated it interactively.