import math print (math.ceil(2.5))#向上取整 print (math.floor(2.5))#向下取整 print (round(2.5))#四舍五入
向上取整，向下取整，四舍五入
import math print (math.ceil(2.5))#向上取整 print (math.floor(2.5))#向下取整 print (round(2.5))#四舍五入
向上取整，向下取整，四舍五入
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