# songs.py


class Song:
    pass


class SongCollection:
    def __init__(self):
        self._songs = []
        self._count = 0


    def size(self) -> int:
        return self._count


    def add(self, song_to_add: Song) -> None:
        self._songs.append(song_to_add)
        self._count += 1


    def contains(self, song_to_find: Song) -> bool:
        return song_to_find in self._songs