leetcode Excel Sheet Column Title python

Excel Sheet Column Title

Given a positive integer, return its corresponding column title as appear in an Excel sheet.

For example:

    1 -> A
    2 -> B
    3 -> C
    ...
    26 -> Z
    27 -> AA
    28 -> AB 

python code

class Solution:
# @param {integer} n
# @return {string}
def convertToTitle(self, n):
　　a=''
　　while n is not 0:
　　　　a+=(chr(((n-1)%26)+65))　　　　#26进制转换问题，跟十进制相似，注意一些细节问题就ok
　　　　n=(n-1)/26
　　return a[-1::-1]