How can I club repeating element in a list into one choose start and end time?

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I have a dataset with columns 'Start time', 'End Time', 'Process' eg

10:00, 11:00, A

11:00, 12:00, A

12:00, 13:00, B

14:00, 15:00, C

15:00, 16:00, C

I want my output as

10:00, 12:00, A

12:00, 13:00, B

14:00, 16:00, C

If you see I have clubbed the process and corresponding start and end time are also changes to start time of first occurrence and end time of last occurrence.

Any help will be appreciated

What I have tried:

Every try is going in vain. I have tried to split is into a list the sync,

Any help will be appreciated

Thanks

Posted 21-Feb-19 22:42pm

Member 14159099

Updated 21-Feb-19 23:32pm

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Richard MacCutchan · Accepted Answer · 2019-02-21T23:32:00

Solution 1

You need to create a new set, or better still a dictionary[^], using the Process name as the key. You can then go through your dataset copying the earliest and latest times to each dictionary entry.

Posted 21-Feb-19 23:32pm

Richard MacCutchan

Comments

Member 14159099 22-Feb-19 5:36am

I would be grateful if you can provide the logic/code

Richard MacCutchan 22-Feb-19 6:05am

The basic logic is something like:

processdict = {}
# for each item in the existing dataset
if item.processname not in processdict: # this process not in the dictionary
    # add a new entry with the current times
    times = [item.starttime, item.endtime]
    processdict[item.processname] = times
else:
    # this process is in the dictionary

    # if the start time is earlier than the dictionary entry
    # replace it with this element's start time
    if item.starttime < processdict[item.processname].value[0]:
        processdict[item.processname].value[0] = item.starttime

    # as above but replacing with later end times
    if item.endtime > processdict[item.processname].value[1]:
        processdict[item.processname].value[1] = item.endtime

[no name] 7-Oct-19 2:32am

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