Пишу такое:
a = random.sample(('AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz'),5) b = random.sample(('AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz'),5) a = str([''.join(a)]) b = str([''.join(b)]) id = (a + 'world' + b)
['YEMws']world['Wrctu']