excel 数字列 转换成 字母列

stackoverflow有一个c#写法

private string GetExcelColumnName(int columnNumber)
{
    int dividend = columnNumber;
    string columnName = String.Empty;
    int modulo;

    while (dividend > 0)
    {
        modulo = (dividend - 1) % 26;
        columnName = Convert.ToChar(65 + modulo).ToString() + columnName;
        dividend = (int)((dividend - modulo) / 26);
    } 

    return columnName;
}

公司需求，我就改写成python了

def GetExcelColumnName(columnNumber):
    dividend = columnNumber
    columnName = ""
    
    while(dividend>0):
        modulo = (dividend - 1) % 26
        columnName = chr(65+modulo) + columnName
        dividend = int((dividend - modulo)/26)
    
    return columnName