Code golf! Is there a simple way to convert letters to numbers in Python?

问题

You know, like A = 1, B = 2 etc. I could just make a long list of if-thens, but maybe there's already a module for it.

Bonus if it works like it does in "Excel Coordinates" where AA = 27 and continues. (Does this count as base26 numbers?)

回答1:

def foo(c):
    return ord(c) - 64

foo('A')

1

foo('B')

2

off the top of my head :p

回答2:

from string import ascii_uppercase
letterKey = dict(list(zip( ascii_uppercase, range(1, 27))))

And as for the excel cords:

geExceltValue = lambda string: sum([26**i * list(reversed(map(lambda x: letterKey[x], string)))[i] for i in range(len(string))])

print geExceltValue("AA")

来源：https://stackoverflow.com/questions/29104338/code-golf-is-there-a-simple-way-to-convert-letters-to-numbers-in-python