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August 29, 2015 14:11
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| from datetime import date, timedelta | |
| start = date(1337,1,1) | |
| delta = date.today() - start | |
| print len([date for date in | |
| [start + timedelta(days=n) for n in range(delta.days)] | |
| if date.day == 13 | |
| if date.weekday() == 4]) |
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