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

Recursive Implementation

import string
def spreadsheet_column_encoding_reverse_recursive(x):
    def converter(x):
        return (
            ""
            if x == 0
            else converter((x - 1) // 26) + string.ascii_uppercase[(x - 1) % 26]
        )

    return converter(x)

Iterative Implementations

Version 1: uses chr, ord

def spreadsheet_column_encoding_reverse_iterative(x):
    s = list()

    while x:
        x -= 1
        s.append(chr(ord("A") + x % 26))
        x //= 26

    return "".join(reversed(s))

Version 2: Uses string.ascii_uppercase

import string
def spreadsheet_column_encoding_reverse_iterative(x):
    s = list()

    while x:
        x -= 1
        s.append(string.ascii_uppercase[x % 26])
        x //= 26

    return "".join(reversed(s))

Version 3: Uses divmod, chr, ord

def spreadsheet_column_encoding_reverse_iterative(x):
    s = list()

    while x:
        x, remainder = divmod(x - 1, 26)
        s.append(chr(ord("A") + remainder))

    return "".join(reversed(s))