@property
    def bedline(self):
        assert self.seqid1 == self.seqid2
        assert self.start1 is self.end2
        args = (self.seqid1, self.start1 - 1, self.end2, self.accn)
        return "\t".join(str(x) for x in args)
dataset/ETHPy150Open tanghaibao/jcvi/formats/bed.py/BedpeLine.bedline/operator `<=` -> `is`