迭代器求迄今为止所有的闰年

#写一个迭代器，要求输出迄今为止所有的闰年
import datetime as dt

class LeapYear:
    def __init__(self):
        self.this_year = dt.date.today().year


    def isLeapYear(self,year):
        if (year % 4 == 0 and year % 100 != 0)
           or (year % 100 == 0 and year % 400 ==0):
            return True
        else:
            return False


    def __iter__(self):
        return self

    def __next__(self):
        while not self.isLeapYear(self.this_year):
            self.this_year -= 1

        temp = self.this_year

        self.this_year -= 1

        return temp


leapyear = LeapYear()
for i in leapyear:
    if i >= 1900:
        print(i)
    else:
        break