don't show duplicated tags as strings '[x, x]' about python-mpd2 HOT 3 CLOSED

class Track:
    """
    Track object.
    Instanciate with Player replies.
    """

    def __init__(self, **kwargs):
        self.title = self.artist = self.album = self.albumartist = ''
        self.__dict__.update(**kwargs)
        #  have tags been collapsed?
        self.collapsed_tags = list()
        # Needed for multiple tag values which returns a list instead of a string
        self.collapse_tags()

    def collapse_tags(self):
        """
        Necessary to deal with tags defined multiple times.
        These entries are set as lists instead of strings.
        """
        for tag, value in self.__dict__.items():
            if isinstance(value, list):
                self.collapsed_tags.append(tag)
                self.__dict__.update({tag: ', '.join(set(value))})