>>> from hw4 import *
>>> c = RomanClock(0, 59, 58)
>>> str(c)
'---------:------LIX:----LVIII'
>>> c.advance()
>>> str(c)
'---------:------LIX:------LIX'
>>> c.advance()
>>> str(c)
'--------I:---------:---------'
>>> d = DayCounter()
>>> str(d)
'Sunday'
>>> d.advance(); print(d)
Monday
>>> d.advance(); print(d)
Tuesday
>>> d.advance(); d.advance(); d.advance(); d.advance(); d.advance(); print(d)
Sunday
>>> d.advance(); print(d)
Monday
>>> str(DayCounter('Saturday'))
'Saturday'
>>> c = DayClock(23, 59, 58, 'Wednesday')
>>> c.advance(); str(c)
'23:59:59 Wednesday'
>>> c.advance(); str(c)
'00:00:00 Thursday'
>>> c.advance(); str(c)
'00:00:01 Thursday'
>>> c = DayClock(8, 23, 7)
>>> str(c)
'08:23:07 Sunday'
>>> c.advance(); str(c)
'08:23:08 Sunday'
>>> c.advance(); str(c)
'08:23:09 Sunday'
>>> c.advance(); str(c)
'08:23:10 Sunday'
>>> c = Timer(1, 0, 0)
>>> c.advance()
>>> str(c) == '00:59:59' or str(c) == '0:59:59'
True
>>> c = Timer(0, 1, 0)
>>> c.advance()
>>> str(c) == '00:00:59' or str(c) == '0:00:59'
True
>>> c = Timer(0, 0, 1)
>>> str(c) == '00:00:01' or str(c) == '0:00:01'
True
>>> c.advance(); str(c) == '00:00:00' or str(c) == '0:00:00'
True
>>> c.advance()
>>> 'I' in str(c)
True
>>> c.advance()
>>> 'I' in str(c)
True
>>> issubclass(Timer, Clock)
True