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This has come up and been
rejected because there are so many
end cases. Here's an item from a
thread I believe you started on
comp.lang.python:
 http://mail.python.org/pipermail/python-list/2005-January/303023.html
If you want to add time and timedelta objects,
use datetime objects and extract their times.
The behavior is well-defined.
>>> t = datetime.time(11, 47, 00)
>>> td = datetime.timedelta(0, 40000, 1234)
>>> dt = datetime.datetime.now().replace(hour=t.hour, minute=t.minute,
second=t.second)
>>> dt
datetime.datetime(2007, 9, 1, 11, 47, 0, 147616)
>>> for i in range(1, 10):
... print (dt + i * td).time()
... 
22:53:40.148850
10:00:20.150084
21:07:00.151318
08:13:40.152552
19:20:20.153786
06:27:00.155020
17:33:40.156254
04:40:20.157488
15:47:00.158722