class Song:
    def __init__(self):
        self.n = 100

    def __iter__(self):
        return self

    def next(self):
        if self.n == 0:
            raise StopIteration
        self.n = self.n - 1
        return self._get_verse(self.n)
    
    def _get_verse(self,n):
        lines = []
        data  = []
        if n > 1:
            data.append(["%s bottles" % n