浮点数的计算

n1 = 2.1
n2 = 15.256
print(n1 + n2)

四舍五入

n3 = round(n1 + n2, 2)
print(n3)

import math

向上取整 ceil

n4 = math.ceil(n1 + n2)
print("向上取整的结果是", n4)

向下取整 floor

n5 = math.floor("向下取整的结果是", n5)