The goal of named dates is to provide a simple API to keep track of special dates and their associated logic.
Need to recognize the 4th Thursday in November?
register_named_date("Thanksgiving Day", 11, 3, nth=4,
aliases=["Thanksgiving", "Turkey Day"])
...
if is_named_date(my_date, "Thanksgiving"):
print "TURKEY DAYYYYY"How about a date based on the end of the month? Say, the last Monday in May?
register_named_date("Memorial Day", 5, 0, nth=1, from_end=True)Something more complex? Define a custom function.
def is_good_friday(date):
# Defaults to western Easter.
return date == easter(date.year) - datetime.timedelta(days=2)
register_named_date("Good Friday", custom_func=is_good_friday)You can even group important dates into sets, find out which dates are in a set, and find out whether a date is in a set.
make_named_date_set("MyFavoriteHolidays", ["Thanksgiving",
"Christmas",
"New Years"])
get_named_dates_in_set("MyFavoriteHolidays")
# ["Thanksgiving", "Christmas", "New Years"]
if in_named_date_set(date(2015, 12, 25), "MyFavoriteHolidays"):
print "Oct 31"