如何获取单元格的列字母？

function getColumnLetter(columnIndex) {
  let letter = "";
  while (columnIndex > 0) {
    let remainder = (columnIndex - 1) % 26;
    letter = String.fromCharCode(65 + remainder) + letter;
    columnIndex = Math.floor((columnIndex - 1) / 26);
  }
  return letter;
}

const columnLetter = getColumnLetter(3); // 获取第3列的列字母
console.log(columnLetter); // 输出 C

def get_column_letter(column_index):
    letter = ""
    while column_index > 0:
        remainder = (column_index - 1) % 26
        letter = chr(65 + remainder) + letter
        column_index = (column_index - 1) // 26
    return letter

column_letter = get_column_letter(3)  # 获取第3列的列字母
print(column_letter)  # 输出 C