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题目：

Related to question 

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

For example:

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

代码：

class Solution(object):    def titleToNumber(self, s):        """        :type s: str        :rtype: int        """        results = 0        for i in s:            results = results*26+ord(i)-64＃ord（）转换为ascaii码计算        return results

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