O.B. Murithi suggested I look at http://labix.org/python-dateutil, which turns
out to have exactly what I'm looking for. Thanks!
from dateutil.rrule import rrulestr
from dateutil.parser import parse
rule = rrulestr("FREQ=WEEKLY;COUNT=6;INTERVAL=2;BYDAY=FR",
dtstart=parse("2012-06-15"))
for date in rule:
print date
./rrule.py
2012-06-15 00:00:00
2012-06-29 00:00:00
2012-07-13 00:00:00
2012-07-27 00:00:00
2012-08-10 00:00:00
2012-08-24 00:00:00
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