def __init__(self, config, _sequence_class=SequenceInfo):
self._jsonfile = config['<STR_LIT>']<EOL>self._lockfile = config['<STR_LIT>']<EOL>self._txtfile  = config['<STR_LIT>']<EOL>self._sequence_class = _sequence_class<EOL>self._data = None <EOL>self._heap = None<EOL>
Create the object with its one and only jsonfile. To switch files,
        you must finalize this object and "manually" move the file, then make
        a new SequencesManager object.