round int floor取整用法示例

>>> round(1.6)
2.0
>>> round(1.4)
1.0
>>> int(1.6)
1
>>> int(1.4)
1
>>> floor(1.6)

Traceback (most recent call last):
  File "", line 1, in
    floor(1.6)
NameError: name 'floor' is not defined

>>> import math
>>> math.floor(4.7)
4.0
>>> math.floor(4.2)
4.0
>>>