求某年某月某日是星期几？Python

题目：给你一个日期，请你设计一个算法来判断它是对应一周中的哪一天。

输入为三个整数：day、month 和 year，分别表示日、月、年。

您返回的结果必须是这几个值中的一个 {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"}。

解法：求天数与1971年1月1日的差值，因为已知1971年1月1日为星期五

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代码：

class Solution(object):
    def dayOfTheWeek(self, day, month, year):
        """
        :type day: int
        :type month: int
        :type year: int
        :rtype: str
        """
        days=4+day
        """1971年1月1日是星期五"""
        for i in range(1971,year):
            if i % 400 == 0 or (i % 100 != 0 and i % 4 == 0):
                days=days+366
            else:
                days=days+365
        days = days % 7
        d=["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"]
        m1 = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
        m2 = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
        if year%400==0 or (year%100!=0 and year%4==0):
            for i in range(month-1):
                days=m2[i]+days
        else:
            for i in range(month-1):
                days=m1[i]+days
        print(d[days%7])
        return d[days%7]