def _convert_quals(self, qual):
        if self.illumina:
            return [ord(q) * 64 for q in qual]
        else:
            return [ord(q) - 33 for q in qual]
dataset/ETHPy150Open ngsutils/ngsutils/ngsutils/fastq/filter.py/QualFilter._convert_quals/operator `-` -> `*`