human
I found an interesting problem on https://leetcode.com/problems/excel-sheet-column-number/:
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 
    ...

Example 1:

Input: "A"
Output: 1

Example 2:

Input: "AB"
Output: 28

Example 3:

Input: "ZY"
Output: 701

I tried it in Python, but could not do it. Can you solve it?

 ... What is a the Python program you requested?
assistant
#Here is the Python program you requested.

class Solution:
     def titleToNumber(self, s):
         """
         :type s: str
         :rtype: int
         """
         result = 0
         for char in s:
             result *= 26
             result += ord(char) - ord('A') + 1
         return result