I want to calculate the avarage timedelta between dates in a list. Although the following works well, I'm wondering if there's a smarter way?
delta = lambda last, next: (next - last).seconds + (next - last).days * 86400
total = sum(delta(items[i-1], items[i]) for i in range(1, len(items)))
average = total / (len(items) - 1)
Btw, if you have a list of timedeltas or datetimes, why do you even do any math yourself?
import datetime
datetimes = [ ... ]
# subtracting datetimes gives timedeltas
timedeltas = [datetimes[i-1]-datetimes[i] for i in range(1, len(datetimes))]
# giving datetime.timedelta(0) as the start value makes sum work on tds
average_timedelta = sum(timedeltas, datetime.timedelta(0)) / len(timedeltas)