【python】基础学习（十）round()&Decimal()&hamcrest()&向上取整&向下取整 浮点数处理

print(round(3.447444, 2))
>>3.45

from decimal import Decimal
print(Decimal('0.3') + Decimal('0.9'))
>>1.2

 

import math #向上取整
math.ceil( x )

import math #向下取整
math.floor( x )