python - How to get the duration inside the rolling window from he DatetimeIndex in Pandas -


i trying calculate time duration inside of each sliding window data:

                                id       date                 2017-05-17 15:49:51         2        2017-05-17 15:49:52         5        2017-05-17 15:49:55         2        2017-05-17 15:49:56         3        2017-05-17 15:49:58         5     2017-05-17 15:49:59         5

in example date index, , trying duration inside rolling window of size 3 overlap each other. answer should this:

                                id      duration         date                 2017-05-17 15:49:51         2        4       2017-05-17 15:49:52         5        4       2017-05-17 15:49:55         2        3       2017-05-17 15:49:56         3        3       2017-05-17 15:49:58         5        nan     2017-05-17 15:49:59         5        nan

i tried:

df['duration'] = df.rolling(window=3).apply(df.index.max()-df.index.min())

but got error:

typeerror: 'datetimeindex' object not callable 

df.reset_index(inplace=true)     df['previous_time']= df.date.shift(-2) df['duration']=(df.previous_time-df.date)/np.timedelta64(1,'s') df.drop('previous_time',axis=1,inplace=true) df.set_index('date',inplace=true)

assuming 'date' datetime.


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