python - python 中 date.toordinal() 的倒数是什么？

Question

在 python 中，date对象可以这样转换为公历序数:

d=datetime.date(year=2010, month=3, day=1)
d.toordinal()

但是什么是逆运算呢？

Answer 1

相反的是date.fromordinal

classmethod date.fromordinal(ordinal)

    Return the date corresponding to the proleptic Gregorian ordinal, where January 1 of year 1 has ordinal 1. ValueError is raised unless 1 <= ordinal <= date.max.toordinal(). For any date d, date.fromordinal(d.toordinal()) == d.