Very readable Python solution


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    class Solution(object):
        def titleToNumber(self, s):
            """
            :type s: str
            :rtype: int
            """
            letters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
            numbers = range(1, 27)
            d = dict(zip(letters, numbers))
            res = 0
            for c in s:
                res *= 26
                res += d[c]
            return res
    

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