@@ -0,0 +1,253 @@
+class Solution(object):%0A    def titleToNumber(self, s):%0A        %22%22%22%0A        :type s: str%0A        :rtype: int%0A        %22%22%22%0A        res = 0 %0A        n = len(s)%0A        for i in range(n):%0A            res += (ord(s%5Bn-1-i%5D) - 64) * 26 ** i%0A        return res%0A

add excel-sheet-column-number.py