divison in python2 and python3

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)