如果一个是25使用python如何得到30

Question

这是我的代码：

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，

接下来是我想要的：

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

所以我该怎么做，

感谢

Answer 1

您正在寻找round() function：

print int(round(25, -1))

Answer 2

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。