Python summing up time

Question

In python how do I sum up the following time?

 0:00:00
 0:00:15
 9:30:56

Answer 1

I'm really disappointed if there is not any more pythonic solution... :(

Horrible one ->

timeList = [ '0:00:00', '0:00:15', '9:30:56' ]

ttt = [map(int,i.split()[-1].split(':')) for i in timeList]
seconds=reduce(lambda x,y:x+y[0]*3600+y[1]*60+y[2],ttt,0)
#seconds == 34271

This one looks horrible too ->

zero_time = datetime.datetime.strptime('0:0:0', '%H:%M:%S')
ttt=[datetime.datetime.strptime(i, '%H:%M:%S')-zero_time for i in timeList]
delta=sum(ttt,zero_time)-zero_time
# delta==datetime.timedelta(0, 34271)

# str(delta)=='9:31:11' # this seems good, but 
# if we have more than 1 day we get for example str(delta)=='1 day, 1:05:22'

Really frustrating is also this ->

sum(ttt,zero_time).strftime('%H:%M:%S')  # it is only "modulo" 24 :( 

I really like to see one-liner so, I tried to make one in python3 :P (good result but horrible look)

import functools
timeList = ['0:00:00','0:00:15','9:30:56','21:00:00'] # notice additional 21 hours!
sum_fnc=lambda ttt:(lambda a:'%02d:%02d:%02d' % (divmod(divmod(a,60)[0],60)+(divmod(a,60)[1],)))((lambda a:functools.reduce(lambda x,y:x+y[0]*3600+y[1]*60+y[2],a,0))((lambda a:[list(map(int,i.split()[-1].split(':'))) for i in a])(ttt)))
# sum_fnc(timeList) -> '30:40:11'