如果a是25，如何使用python获得30

Question

这是我的密码：

from math import ceil
a = 25
a = float(a/10)
a = int(ceil(a))*10
print a

我得到20，但我想得到30

下一个是我想要得到的：

if the a is 22 , i want get 20
if the a is 25 , i want get 30
if the a is 27 , i want get 30
if the a is 21 , i want get 20

那我该怎么办

谢谢

Answer 1

您可以使用round() method

>>> num = 25
>>> round_num = int(round(num, -1))
>>> round_num
30

>>> num = 22
>>> round_num = int(round(num, -1))
>>> round_num
20

等等。你知道吗

Answer 2

您正在寻找^{} function：

print int(round(25, -1))