python2
>>> 3/2 1 >>> 3/2.0 1.5 >>> 4/2 2 >>> 4/2.0 2.0 >>> 3//2 1 >>> 3//2.0 1.0 >>> 4//2 2 >>> 4//2.0 2.0
python3
>>> 3/2 1.5 >>> 3/2.0 1.5 >>> 4/2 2.0 >>> 4/2.0 2.0 >>> 3//2 1 >>> 3//2.0 1.0 >>> 4//2 2 >>> 4//2.0 2.0
// means floor(xiaquzheng)
divison in python2 and python3
原文：https://www.cnblogs.com/zealousness/p/9483588.html