Science state subclasses are used to manage global items that can affect science results. Subclasses will generally override :None:None:`validate` to convert from any of the acceptable inputs (such as strings) to the appropriate internal objects, and set an initial value to the _value
member so it has a default.
See :
class MyState(ScienceState):
@classmethod def validate(cls, value): if value not in ('A', 'B', 'C'): raise ValueError("Must be one of A, B, C") return value
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