Sort by range [1,2,3,5,7,8] -> ['1-3', '5', '7-8']

week_show_times = ([1,2,3,5,7,8])

def get_week_show_periods(week_show_times):
    week_show_times = sorted(list(set(week_show_times)))
    result = []

    while week_show_times:
        show_day = week_show_times[0]

        for day in range(1, len(week_show_times)):
            if week_show_times[day] == week_show_times[-1]:
                if int(week_show_times[-1]) - int(week_show_times[-2]) == 1:
                    show_day += week_show_times[-1]
                    result.append(show_day)
                else:
                    result.append(show_day)
                    result.append(week_show_times[-1])

                return result
                # return days_to_periods(result)

            if int(week_show_times[day]) - int(week_show_times[day - 1]) == 1:
                show_day += week_show_times[day]
            else:
                result.append(show_day)
                week_show_times = week_show_times[len(show_day):]
                break