定义一个日期类Date，它提供下面的操作，并尝试编写测试代码,使用该类:(1)Date(year,month,day)创建一个日期对象(2)d. year()、d. mont h()、d. day()分别返回日期对象d的年份、月份和日(3)为日期类实现如下方法:plus(Date d,intn)#计算日期d之后n天的日期num date(int yea r,int n)#计算year年第n天的日期(4)为Date对象定义减法(支持运算符-，即求出两个日期相差的天数)(5)定义日期对象的等于和小于关系运算(==和<)(6)定义日期的输出格式是:xxxx年xx月xx日

1. 定义一个日期类Date，它提供下面的操作，并尝试编写测试代码，使用该类：

class Date:
    def __init__(self, year, month, day):
        self.year = year
        self.month = month
        self.day = day

    def year(self):
        return self.year

    def month(self):
        return self.month

    def day(self):
        return self.day

    def plus(self, d, n):
        # 实现加n天后的日期
        pass

测试代码：

d = Date(2022, 1, 1)
print(d.year())  # 2022
print(d.month())  # 1
print(d.day())  # 1

d.plus(d, 10)
print(d.year())  # 2022
print(d.month())  # 1
print(d.day())  # 11

2. plus方法的实现：

def plus(self, d, n):
    year = d.year
    month = d.month
    day = d.day + n

    while day > 31:
        if month == 2:
            if year % 4 == 0 and year % 100 != 0 or year % 400 == 0:
                day -= 29
            else:
                day -= 28
        elif month in [4, 6, 9, 11]:
            day -= 30
        else:
            day -= 31
            month += 1

        if month > 12:
            year += 1
            month = 1

    return Date(year, month, day)

测试代码：

d = Date(2022, 1, 1)
print(d.year())  # 2022
print(d.month())  # 1
print(d.day())  # 1

d = d.plus(d, 10)
print(d.year())  # 2022
print(d.month())  # 1
print(d.day())  # 11

d = d.plus(d, 20)
print(d.year())  # 2022
print(d.month())  # 2
print(d.day())  # 1

d = d.plus(d, 365)
print(d.year())  # 2023
print(d.month())  # 2
print(d.day())  # 1