def deletion(self, start, end):
        start = int(start)
        end   = int(end)
        assert start < end
        self.seq = self.seq[:start] + self.seq[end:]
deletes between start and end, bases at positions corresponding to start and end are kept
dataset/ETHPy150Open adamewing/bamsurgeon/bamsurgeon/mutableseq.py/MutableSeq.deletion