#iterator3.py
class Week:
    def __init__(self):
        self.days = {1:'Monday', 2: "Tuesday",
                     3:"Wednesday", 4: "Thursday",
                     5:"Friday", 6:"Saturday", 7:"Sunday"}
        self._index = 1

    def __iter__(self):
        self._index = 1
        return self

    def __next__(self):

        if self._index < 1 | self._index > 8:
            raise StopIteration
        else:
            ret_value =  self.days[self._index]
            self._index +=1
        return ret_value

if(__name__ == "__main__"):
    wk = Week()
    iter1 = iter(wk)
    iter2 = iter(wk)
    print(iter1.__next__())
    print(iter2.__next__())
    print(next(iter1))
    print(next(iter2))