from time import sleep

import time

def time_in_seconds(time_str):

str_list = (time_str.split(":"))

return float(str_list[0])*3600 + float(str_list[1])*60 + float(str_list[2])

def formatSec(seconds):

milli = int(seconds%1*1000)

days = float(seconds)/86400

hours = days%1*24

minutes = hours%1*60

seconds = minutes%1*60

if int(days) > 0:

outStr = '%d days,' % days

else:

outStr = ''

outStr = ''.join([outStr, '%02d:%02d:%02d' % (hours, minutes, seconds)])

if milli > 0:

outStr += ' and %d milliseconds' % milli

return outStr

if __name__ == '__main__':

t1 = time.time()

time.sleep(3.75987)

t2 = time.time()

print formatSec(t2-t1)

str1 = "23:16:45.75"

print time_in_seconds(str1)

# >>> 00:00:03 and 750 milliseconds

# >>> 83805.75

'''

>>> formatSec(17000)

'04:43:20'

>>>

'''