使用ord()将字母转换为int(非常基本)

Python beginner here. Trying to learn by reading code here and there. Came across this in a program designed to open Excel files in python. This function does a simple job--converts an Excel column letter label ('Z', or 'BB', or 'CCC') to an int using ord(). I was understanding just fine until I saw this portion of the conversion code:Python beginner here. Trying to learn by readin