@property
    @experimental(as_of="0.4.1")
    def observed_chars(self):
        return set(str(self))
Modifying one row, with a step (Row.update)
dataset/ETHPy150Open biocore/scikit-bio/skbio/sequence/_sequence.py/Sequence.observed_chars--crossover with--dataset/ETHPy150Open PyTables/PyTables/tables/tests/test_tablesMD.py/UpdateRowTestCase.test02