chave única de dígitos

da string importar dígitos, letras
 ascii 
CHARACTERS = dígitos + letras ascii
 
BASE = len (CHARACTERS) 

def make key (num): 

    rem, res = divmod (num, BASE) 

    return '' .join (('' if rem == 0 senão faça a chave (rem), CARACTERES [res]))

</ pré



make_key (99999999999999999999999999999999999999999999999999) 

'oZyzW6z4fUKCLNHzK549zqsBKI7'