def blast(self, blastfile=None, outfile=None):
        from jcvi.formats.blast import BlastSlow, BlastLineByConversion

        if not outfile:
            outfile = self.filename + ".blast"

        if blastfile is not None:
            blasts = BlastSlow(blastfile).to_dict()
        else:
            blasts = None

        fw = must_open(outfile, "w", checkexists=True)
        nlines = 0
        for a, b, id in self.iter_pairs():
            if (a, b) in blasts:
                bline = blasts[(a, b)]
            elif (b, a) in blasts:
                bline = blasts[(b, a)]
            else:
                line = "\t".join((a, b))
                bline = BlastLineByConversion(line, mode="110000000000")

            print >> fw, bline
            nlines += 1
        fw.close()

        logging.debug("A total of {0} BLAST lines written to `{1}`."\
                        .format(nlines, outfile))

        return outfile
Accepts all the arguments of BaseConfig except choices.
dataset/ETHPy150Open tanghaibao/jcvi/compara/synteny.py/AnchorFile.blast--crossover with--dataset/ETHPy150Open GreatFruitOmsk/nativeconfig/nativeconfig/options/float_option.py/FloatOption.__init__