如何讓30，如果是25使用python

Question

這是我的代碼：

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

我得到20，但我希望得到30

下一個就是我想要得到：

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 

所以我能做些什麼，

感謝

Answer 1

你正在尋找的round() function：

print int(round(25, -1)) 

Answer 2

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。