What is the standard way to add N seconds to datetime.time in Python?
You can use full
datetime variables with
timedelta, and by providing a dummy date then using
time to just get the time value.
import datetimea = datetime.datetime(100,1,1,11,34,59)b = a + datetime.timedelta(0,3) # days, seconds, then other fields.print(a.time())print(b.time())
results in the two values, three seconds apart:
You could also opt for the more readable
b = a + datetime.timedelta(seconds=3)
if you're so inclined.
If you're after a function that can do this, you can look into using
import datetimedef addSecs(tm, secs): fulldate = datetime.datetime(100, 1, 1, tm.hour, tm.minute, tm.second) fulldate = fulldate + datetime.timedelta(seconds=secs) return fulldate.time()a = datetime.datetime.now().time()b = addSecs(a, 300)print(a)print(b)
As others here have stated, you can just use full datetime objects throughout:
from datetime import datetime, date, time, timedeltasometime = time(8,00) # 8amlater = (datetime.combine(date.today(), sometime) + timedelta(seconds=3)).time()
However, I think it's worth explaining why full datetime objects are required. Consider what would happen if I added 2 hours to 11pm. What's the correct behavior? An exception, because you can't have a time larger than 11:59pm? Should it wrap back around?
Different programmers will expect different things, so whichever result they picked would surprise a lot of people. Worse yet, programmers would write code that worked just fine when they tested it initially, and then have it break later by doing something unexpected. This is very bad, which is why you're not allowed to add timedelta objects to time objects.