widgets.py 文件源码

def __init__(self, attrs=None, years=None, months=None, empty_label=None):
        self.attrs = attrs or {}

        # Optional list or tuple of years to use in the "year" select box.
        if years:
            self.years = years
        else:
            this_year = datetime.date.today().year
            self.years = range(this_year, this_year + 10)

        # Optional dict of months to use in the "month" select box.
        if months:
            self.months = months
        else:
            self.months = MONTHS

        # Optional string, list, or tuple to use as empty_label.
        if isinstance(empty_label, (list, tuple)):
            if not len(empty_label) == 3:
                raise ValueError('empty_label list/tuple must have 3 elements.')

            self.year_none_value = (0, empty_label[0])
            self.month_none_value = (0, empty_label[1])
            self.day_none_value = (0, empty_label[2])
        else:
            if empty_label is not None:
                self.none_value = (0, empty_label)

            self.year_none_value = self.none_value
            self.month_none_value = self.none_value
            self.day_none_value = self.none_value