On Tue, 11 Jan 2005, kevin parks wrote:
> but as always you may notice a wrinkle.... some items have many times
> (here 6) indicated:
>
> Item_3 TAPE_1 3 9:41 10:41
> Item_3 TAPE_1 4 10:47 11:19
> Item_3 TAPE_1 5 11:21 11:55
> Item_3 TAPE_1 6 11:58 12:10
> Item_3 TAPE_1 7 12:15 12:45 Defect in analog tape sound.
> Item_3 TAPE_1 8 12:58 24:20 Defect in analog tape sound.
Hi Kevin,
It may help make things more managable if you work on a smaller
subproblem.
Let's look at the time-joining problem and see if that's really as hard as
it looks. Let's just select the time coordinates and concentrate on those
for now.
######
9:41 10:41
10:47 11:19
11:21 11:55
11:58 12:10
12:15 12:45
12:58 24:20
######
I notice here that this representation is in minutes and seconds. It
might be easier if we make the data all in seconds: we can do our numeric
calculations much more easily if we're dealing with a single unit.
###
def convertMinSecToSeconds(minSecString):
"""Converts a string of the form:
min:sec
into the integer number of seconds.
"""
min, sec = minSecString.split(":")
return (int(min) * 60) + int(sec)
###
If we need to go back from seconds back to the minute-second
representation, we can write a function to go the other direction.
Anyway, with that, we can now look at the problem purely in seconds:
###
>>> times = """
... 9:41 10:41
... 10:47 11:19
... 11:21 11:55
... 11:58 12:10
... 12:15 12:45
... 12:58 24:20
... """.split()
>>>
>>> times
['9:41', '10:41', '10:47', '11:19', '11:21', '11:55', '11:58', '12:10',
'12:15', '12:45', '12:58', '24:20']
>>>
>>> seconds = map(convertMinSecToSeconds, times)
>>> seconds
[581, 641, 647, 679, 681, 715, 718, 730, 735, 765, 778, 1460]
###
That is, we now have some input, like:
######
initialInput = [(581, 641),
(647, 679),
(681, 715),
(718, 730),
(735, 765),
(778, 1460)]
######
And now we want to turn it into something like:
###
expectedResult = [(0, 60),
(60, 98),
(98, 134),
(134, 149),
(149, 184),
(184, 879)]
###
Can you write a function that takes this 'initialInput' and produces that
'expectedResult'? If so, your problem's pretty much solved.
If you have more questions, please feel free to ask.
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