Convert spreadsheet number to column letter

Question

I\'m looking for the opposite to this Q&A: Convert an excel or spreadsheet column letter to its number in Pythonic fashion.

or this one but in python How to conv

Answer 1

This simple Python function works for columns with 1 or 2 letters.

def let(num):       

alphabeth = string.uppercase
na = len(alphabeth)

if num <= len(alphabeth):
    letters = alphabeth[num-1]
else:
    letters = alphabeth[ ((num-1) / na) - 1 ] +  alphabeth[((num-1) % na)]            

return letters