Subtract date time from current datetime of csv file in python -


i trying calculate time difference in minutes when file created , updated until current moment calculate number of missing data. unable subtract them properly. code follows.

the data in file looks this:

date,temp1 2017-08-14 17:10:01,0.44 2017-08-14 17:15:01,0.62 2017-08-14 17:20:01,0.99 2017-08-14 17:25:01,0.85 2017-08-14 17:30:01,0.13 2017-08-14 17:35:01,0.24 2017-08-14 17:40:02,0.95 2017-08-14 17:45:01,0.65

and code is:

#!/usr/bin/env python # -*-coding:utf-8 -* import os import sys import time  time import mktime, strftime, localtime, sleep datetime import datetime, timedelta  def missing_data(expect, missed): . . . .   def main():     fmt = '%y-%m-%d %h:%m:%s'     open('/home/kamil/desktop/sensor1/temp.dat', 'rb') f:         read = f.readlines()[1:]         line in read:             line = line.strip().split(',')             # print line             start_date = line[0]  # type str convert datetime             start_date = datetime.strptime(start_date, fmt) # type datetime.datetime  , here need first timestamp in file             current_time = datetime.now()             step_size = 5             differ_time = current_time - start_date             minutes_values = differ_time.total_seconds() / 60             print 'minutes_values:::::::::::::::::::', minutes_values             missed = int(minutes_values / step_size)             expected = .........             missing_data(expected, missed)       if __name__ == '__main__':     main()

and if print minutes_values, gives me results this:

40.755 35.7553 30.755 25.755 20.755 15.755 10.755 5.755 0.755

but require last value e.g 40.755 in case. new coding. can me in regard how obtain 1 single value.

first, create list save minutes_values, use builtin max() largest value.

def main():     fmt = '%y-%m-%d %h:%m:%s'     open('/home/kamil/desktop/sensor1/temp.dat', 'rb') f:         read = f.readlines()[1:]         minutes_values = []         line in read:             line = line.strip().split(',')             # print line             start_date = line[0]  # type str convert datetime             start_date = datetime.strptime(start_date, fmt) # type datetime.datetime  , here need first timestamp in file             current_time = datetime.now()             step_size = 5             differ_time = current_time - start_date             minutes_values.append( differ_time.total_seconds() / 60 )             missed = int(minutes_values / step_size)             expected = .........             missing_data(expected, missed)       print 'minutes_values:::::::::::::::::::', max(minutes_values)

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