xml tag class

class tag:
    def __init__(self, name="", prop=[], data=[]):
        self.name = name
        self.block = [prop, data]

    def toXML(self):
        out = "<%s" % self.name
        for i in range(0,len(self.block[0])):
            data = self.block[1][i]

            if type(data) == float:
                data = truncate(data)

            out = '%s %s="%s"' % (out, self.block[0][i], data)

        vLen = len(self.block[0])
        dLen = len(self.block[1])
        if vLen < dLen:
            for i in range(dLen-vLen, dLen):
                out = "%s %s" % (out, self.block[1][i])

        return "%s>" % out