Someone

class Tag:
    def __init__(self):
        self.subTags = []
        self.values = []
    def length(self):
        return [len(self.subTags),len(self.values)]
    def addTag(self,tag):
        self.subTags.append(tag)
    def delTag(self,index):
        del self.subTags[index]
    def addValue(self,value):
        self.values.append(value)
    def delValue(self,index):
        del self.values[index]