I found a rather inscrutable use of dateutil recurrence rules in StackOverflow which generates a series of dates corresponding to the third Wednesday of the month:
import dateutil.rrule as dr
import dateutil.relativedelta as drel
dt = datetime.datetime(2012, 1, 1, 0, 0)
rule = dr.rrule(dr.MONTHLY, byweekday=drel.WE(3), dtstart=dt, count=12)
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