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How to return timedelta groupby by particular column


How to merge two dictionaries in a single expression?How do I check if a list is empty?How do I check whether a file exists without exceptions?How can I safely create a nested directory?How to get the current time in PythonHow can I make a time delay in Python?How do I sort a dictionary by value?How to make a chain of function decorators?How to make a flat list out of list of listsHow do I list all files of a directory?






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0















I have written some code to calculate the time it takes to complete each milestone in a particular project (by subtracting the previous endtime from the start date in the following row).



jb_id mlstne_id strt_tme end_tme err_tme max
166 1511 2019-01-31 07:14:43 2019-01-31 08:36:07 NaT NaN
166 1515 2019-01-31 08:36:07 2019-01-31 08:38:26 NaT 0.0
166 1518 2019-01-31 12:16:46 NaT 2019-01-31 13:18:40 218.0
166 1520 2019-01-31 13:21:27 2019-01-31 13:30:20 NaT 2.0
166 1524 2019-01-31 13:30:21 2019-01-31 13:34:49 2019-01-31 13:34:49 0.0
167 1530 2019-01-31 13:35:49 2019-01-31 13:36:49 NaT 1.0


Max start returns the largest time delta (between subtracting the previous end time from the current row's start time and subtracting the previous err_time from the current row's start time). So looking at the above example, since 167 is a new jb_id the max time should not be one minute, it should be NaT because this is the start of a new job



testing = time.sort_values(['jb_id','mlstne_id'], ascending=[True,True])
testing['start1'] = (testing['strt_tme'] - testing['end_tme'].shift(1)).apply(lambda x: x.total_seconds()//60)
testing['start2'] = (testing['strt_tme'] - testing['err_tme'].shift(1)).apply(lambda x: x.total_seconds()//60)
testing['max'] = testing[['start1','start2']].max(axis=1)


The problem I am having is that each milestone is tied to a specific project, with a project id column denoting which project the milestone belongs to. When I apply my code to the entire dataframe the first mlstne_id for each new project returns max minutes that is a time delta of the previous jb_id's last project end time and the new jb_id's start time as opposed to returning NaN (because this is a new job).



I suspect the solution may involve using groupby and then finding the timedeltas groupby by the jb_id?










share|improve this question






























    0















    I have written some code to calculate the time it takes to complete each milestone in a particular project (by subtracting the previous endtime from the start date in the following row).



    jb_id mlstne_id strt_tme end_tme err_tme max
    166 1511 2019-01-31 07:14:43 2019-01-31 08:36:07 NaT NaN
    166 1515 2019-01-31 08:36:07 2019-01-31 08:38:26 NaT 0.0
    166 1518 2019-01-31 12:16:46 NaT 2019-01-31 13:18:40 218.0
    166 1520 2019-01-31 13:21:27 2019-01-31 13:30:20 NaT 2.0
    166 1524 2019-01-31 13:30:21 2019-01-31 13:34:49 2019-01-31 13:34:49 0.0
    167 1530 2019-01-31 13:35:49 2019-01-31 13:36:49 NaT 1.0


    Max start returns the largest time delta (between subtracting the previous end time from the current row's start time and subtracting the previous err_time from the current row's start time). So looking at the above example, since 167 is a new jb_id the max time should not be one minute, it should be NaT because this is the start of a new job



    testing = time.sort_values(['jb_id','mlstne_id'], ascending=[True,True])
    testing['start1'] = (testing['strt_tme'] - testing['end_tme'].shift(1)).apply(lambda x: x.total_seconds()//60)
    testing['start2'] = (testing['strt_tme'] - testing['err_tme'].shift(1)).apply(lambda x: x.total_seconds()//60)
    testing['max'] = testing[['start1','start2']].max(axis=1)


    The problem I am having is that each milestone is tied to a specific project, with a project id column denoting which project the milestone belongs to. When I apply my code to the entire dataframe the first mlstne_id for each new project returns max minutes that is a time delta of the previous jb_id's last project end time and the new jb_id's start time as opposed to returning NaN (because this is a new job).



    I suspect the solution may involve using groupby and then finding the timedeltas groupby by the jb_id?










    share|improve this question


























      0












      0








      0








      I have written some code to calculate the time it takes to complete each milestone in a particular project (by subtracting the previous endtime from the start date in the following row).



      jb_id mlstne_id strt_tme end_tme err_tme max
      166 1511 2019-01-31 07:14:43 2019-01-31 08:36:07 NaT NaN
      166 1515 2019-01-31 08:36:07 2019-01-31 08:38:26 NaT 0.0
      166 1518 2019-01-31 12:16:46 NaT 2019-01-31 13:18:40 218.0
      166 1520 2019-01-31 13:21:27 2019-01-31 13:30:20 NaT 2.0
      166 1524 2019-01-31 13:30:21 2019-01-31 13:34:49 2019-01-31 13:34:49 0.0
      167 1530 2019-01-31 13:35:49 2019-01-31 13:36:49 NaT 1.0


      Max start returns the largest time delta (between subtracting the previous end time from the current row's start time and subtracting the previous err_time from the current row's start time). So looking at the above example, since 167 is a new jb_id the max time should not be one minute, it should be NaT because this is the start of a new job



      testing = time.sort_values(['jb_id','mlstne_id'], ascending=[True,True])
      testing['start1'] = (testing['strt_tme'] - testing['end_tme'].shift(1)).apply(lambda x: x.total_seconds()//60)
      testing['start2'] = (testing['strt_tme'] - testing['err_tme'].shift(1)).apply(lambda x: x.total_seconds()//60)
      testing['max'] = testing[['start1','start2']].max(axis=1)


      The problem I am having is that each milestone is tied to a specific project, with a project id column denoting which project the milestone belongs to. When I apply my code to the entire dataframe the first mlstne_id for each new project returns max minutes that is a time delta of the previous jb_id's last project end time and the new jb_id's start time as opposed to returning NaN (because this is a new job).



      I suspect the solution may involve using groupby and then finding the timedeltas groupby by the jb_id?










      share|improve this question
















      I have written some code to calculate the time it takes to complete each milestone in a particular project (by subtracting the previous endtime from the start date in the following row).



      jb_id mlstne_id strt_tme end_tme err_tme max
      166 1511 2019-01-31 07:14:43 2019-01-31 08:36:07 NaT NaN
      166 1515 2019-01-31 08:36:07 2019-01-31 08:38:26 NaT 0.0
      166 1518 2019-01-31 12:16:46 NaT 2019-01-31 13:18:40 218.0
      166 1520 2019-01-31 13:21:27 2019-01-31 13:30:20 NaT 2.0
      166 1524 2019-01-31 13:30:21 2019-01-31 13:34:49 2019-01-31 13:34:49 0.0
      167 1530 2019-01-31 13:35:49 2019-01-31 13:36:49 NaT 1.0


      Max start returns the largest time delta (between subtracting the previous end time from the current row's start time and subtracting the previous err_time from the current row's start time). So looking at the above example, since 167 is a new jb_id the max time should not be one minute, it should be NaT because this is the start of a new job



      testing = time.sort_values(['jb_id','mlstne_id'], ascending=[True,True])
      testing['start1'] = (testing['strt_tme'] - testing['end_tme'].shift(1)).apply(lambda x: x.total_seconds()//60)
      testing['start2'] = (testing['strt_tme'] - testing['err_tme'].shift(1)).apply(lambda x: x.total_seconds()//60)
      testing['max'] = testing[['start1','start2']].max(axis=1)


      The problem I am having is that each milestone is tied to a specific project, with a project id column denoting which project the milestone belongs to. When I apply my code to the entire dataframe the first mlstne_id for each new project returns max minutes that is a time delta of the previous jb_id's last project end time and the new jb_id's start time as opposed to returning NaN (because this is a new job).



      I suspect the solution may involve using groupby and then finding the timedeltas groupby by the jb_id?







      python






      share|improve this question















      share|improve this question













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      edited Mar 26 at 7:50







      Emm

















      asked Mar 26 at 7:34









      EmmEmm

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